1240: All that is left from a cracking day's play, then, is women's third seed Svetlana Kuznetsova's match against Angelique Kerber of Germany - and for that I will leave you with our live scoring. You've all been wonderful (dahhling), be back for our text commentary this evening from just before midnight-ish. Saturday morning from 0800 GMT we have home favourite Lleyton Hewitt's match against Cypriot Marcos Baghdatis for your viewing pleasure on the red button and online (UK only), followed by Caroline Wozniacki of Denmark against Israel's Shahar Peer. The Hewitt-Baghdatis match, by the way, will be the feature match in the BBC1 highlights at 1300 - also streamed on this very website - while Radio 5 Live sports extra will be available for your aural pleasure too. Oh - and don't forget, we have highlights of Andy Murray's win over Florent Serra on freeview and the website (UK only) from round about, ooh, now. Bye!

"That was very close. It was a long match, hard work, and I'll be a bit tired tomorrow - but I will be OK - I can survive these matches. I'm very happy with a fourth round place."
Rafael Nadal after beating Philipp Kohlschreiber

1227: The roars erupt over in the Hisense Arena as Ivo Karlovic sends another seed packing with a 6-3 3-6 6-3 7-6 (9-7) victory over Croatian countryman and 24th seed Ivan Ljubicic. His reward is a match-up with Rafael Nadal and that should prove a fascinating contest - the big man with the massive serve against the little technician with the massive left arm.

"Sam, that has to be one of the best matches I've ever witnessed. Sensational stuff all round!"
Max, London via text

"Rafa knew he was in for a big battle and had to come up with some big winners to get through that. The worrying part for Nadal was how many times his serve was under threat - and going up against better players he was a few things to work on."
John Lloyd on our BBC coverage

Kohlschreiber 4-6 2-6 6-2 5-7 Nadal
That's it! A titanic tussle comes to an end as Nadal, aided by another cracking forehand down the line and some well aimed serves out wide, holds to 15 to close out the match after nearly four hours. Brilliant and dogged in equal measure - from both players - but a huge win for Rafa. A sign he is not at his best, or just what he needs in this Aussie Open charge? Huge ovation for the pair - PK has certainly won a lot of supporters with his performance this evening - can Nadal now go from strength to strength?

Kohlschreiber 4-6 2-6 6-2 5-6 Nadal*
This set has had more swings than a children's play-park... and there's another - Rafael Nadal, staring down the barrel a couple of games ago - injecting yet more genius into the encounter to break PK at a crucial time to 15, sealed when the German flashes deep and wide with a running backhand. Match over you say? Do not write this off just yet folks...
* denotes NEXT server

*Kohlschreiber 4-6 2-6 6-2 5-5 Nadal
A rare snip of a game as Nadal holds to 15 to stay in the set.
* denotes NEXT server

Kohlschreiber 4-6 2-6 6-2 5-4 Nadal*
Well, how's the momentum now people? A booming ace and groundstrokes containing more power than Popeye's forearms and PK puts himself within a game of taking this match into a fifth set.
* denotes NEXT server

*Kohlschreiber 4-6 2-6 6-2 4-4 Nadal
If you want a solid gold ideal of what Grand Slam tennis matches are all about, you could do worse than bottle this match up and sell it over the counter for a sack of silver. Both players are making shot after shot, Nadal raising the roof with forehand winners and PK responding with ball striking of the highest order. An unreturnable forehand earns PK a break-back point and Rafa misses a backhand return to hand the game to his opponent. Staggering.
* denotes NEXT server

"To get the break with that running forehand - that is all the hours of work Rafa does on the physical side, and that can be the difference in winning a match like this."
John Lloyd on our BBC coverage

Kohlschreiber 4-6 2-6 6-2 3-4 Nadal*
BREAK! Unbelievable from Rafael Nadal - and the Spaniard has his magical groundstrokes to thank for him stealing a march in this match again. First a superb whipped forehand down the line brings up the break point, and then the world number two seals it with a run-around forehand across the court that PK can only watch whizz by his ankles. Crucial break, and the momentum swings again.
* denotes NEXT server

*Kohlschreiber 4-6 2-6 6-2 3-3 Nadal
Controlled aggression from Nadal as he brushes off a forehand service return winner from PK to move his way to the hold with a gorgeous crosscourt winner. Tennis of the highest quality in that game - as it has for the whole match really. Who or what is going to give?
* denotes NEXT server

"If PK wins this he should make the most of the marketing opportunity. Maybe get his own kohl-ogne. A brand of kohl-slaw. Set up his own kohl-ege scholarship...?"
Lewis, Norwich via text

Kohlschreiber 4-6 2-6 6-2 3-2 Nadal*
Another big, big hold for PK as he holds off a Rafa fightback from 0-40 down to hold to deuce courtesy of an ace and serve-volley to which Nadal has no answer. Signs Nadal is getting his mojo back in that game, but PK continues to forage forward in impressive fashion.
* denotes NEXT server

1141: Marin Cilic, who is building some real momentum in this tournament, sets up a fourth-round match against US Open champion Juan Martin del Potro with a 4-6 6-4 6-3 6-3 win over Stanislas Wawrinka.

*Kohlschreiber 4-6 2-6 6-2 2-2 Nadal
Rafael Nadal is definitely feeling the pinch here - and yet somehow he produces moments of genius few others could replicate, no example better than a whipped backhand from behind the baseline and outside the court that leaves PK reeling at the net. Hold for the Spaniard - and as this match nears the three-hour mark, Nadal has won just one more point than his opponent.
* denotes NEXT server

"The Kohl-Train lost steam in that second set, but he seems to have found some momentum at the moment thankfully!"
Rob, Wolverhampton via text

Kohlschreiber 4-6 2-6 6-2 2-1 Nadal*
No such problems for Kohlschreiber and an ace down the 'T' seals a simple hold to 15.
* denotes NEXT server

*Kohlschreiber 4-6 2-6 6-2 1-1 Nadal
Deary me, suddenly Rafael Nadal is hanging on in this match by his back teeth alone - but hanging on he is. PK again rattles up the break-point opportunities, but once again he misses the chances as Rafael Nadal whips a forehand winner or ripped serve just when he needs it to hold it after a multi-deuce game, the low slice to the forehand more often than not proving PK's Achilles heel.
* denotes NEXT server

Kohlschreiber 4-6 2-6 6-2 1-0 Nadal*
Brilliance from PK, not least on game point with a beautiful back hand, and it's a crucial hold to start the fourth set.
* denotes NEXT server

"Kohlschreiber cut down on the unforced errors in that set and it just shows you even the great ones like Nadal can throw in some horrible points. This match has been going on for two and a half hours now, but Kohlschreiber isn't showing any signs of fatigue. Can he keep it up?"
John Lloyd on our BBC coverage

1120: Ivo Karlovic looks on course to restore his lead over in the Hisense Arena as he leads in the third set for a 6-3 3-6 5-3 advantage over Ivan Ljubicic, while Marin Cilic is even further along in his push for a fourth-round spot as he leads Stanislas Wawrinka 4-6 6-4 6-3 5-2 in the Margaret Court Arena.

*Kohlschreiber 4-6 2-6 6-2 Nadal
Rafael Nadal, at exactly the wrong time, has been hit by the jingle-jangles and a double fault and ropey ol' forehand gift PK a second break and the third set. We have a match ladies and gentlemen.
* denotes NEXT server

Kohlschreiber 4-6 2-6 5-2 Nadal*
Huge hold. Rafael Nadal, keeping the ball in court deep on the baseline, forces the ever-tightening German into the errors as he strolls into a 0-40 lead. PK saves all three behind a booming first serve, though, and despite always having to play that extra shot thanks to Rafa's stunning mobility around the court, the 27th seed seals the game when a Nadal forehand finds the net. Massive.
* denotes NEXT server

*Kohlschreiber 4-6 2-6 4-2 Nadal
The games whizzing by, now, with PK apparently concentrating on his holds. Nadal will not want this to go to four sets, though...
* denotes NEXT server

Kohlschreiber 4-6 2-6 4-1 Nadal*
And just like that, the three-game gap is restored, Kohlschreiber holding to love behind an excellent first-serve percentage. So far, you're looking at a 36-43 winners-unforced errors ratio from PK, with 25 apiece from Nadal. PK pushing each and every point and reaping the benefits this set.
* denotes NEXT server

*Kohlschreiber 4-6 2-6 3-1 Nadal
PK takes a breather and Nadal gets his first game of the set on the board with a comfortable hold to 15.
* denotes NEXT server

Kohlschreiber 4-6 2-6 3-0 Nadal*
Rafael Nadal has not hit his straps fully yet by any means today, but this is still hugely impressive from PK. The German again has to delve into his guts for yet more reserves of resolve as Nadal battles back from 40-15 against serve, and PK punches a forehand winner on his way to the hold. Lovely.
* denotes NEXT server

"Re: Nadal's second-set sealer: I did see a better shot, in the third set from a certain Andrew Murray. One for the highlights, so John Lloyd said."
Russell, Edinburgh via text
Funny you should mention that, Russell, but you can watch highlights of Muzza's match - including that shot, of course - immediately after the PK-Nadal match on Freeview. What a plug that is. Bootiful.

*Kohlschreiber 4-6 2-6 2-0 Nadal
I tell you what, there's no doubting PK's heart out there - very occasionally, this match resembles a duck quacking at a cruise-liner in terms of genius ability, but Kohlschreiber is harnessing all his spirit in one tight grip and at the 10th time of asking he breaks Nadal, sealing the game with a doozy of a point - pushing and pulling the world number two around the court before sealing it with a backhand down the line.
* denotes NEXT server

Kohlschreiber 4-6 2-6 1-0 Nadal*
Vital hold. Precious. And admirable resolve shown by PK. Now where does he go from here?
* denotes NEXT server

randalthor1812 on Twitter: "How would you describe Nadal's shorts then? I'm going for fishnet shorts. Can't believe he saw those and thought 'yes'..."

"Let's see if Kohlschreiber's got the stomach to come back. It's a very daunting prospect being two sets down to Nadal but you've got to somehow believe you can do it - otherwise it's time to shake hands."
John Lloyd on our BBC coverage

1041: Marin Cilic has just gone two sets to one up in his match against Stanislas Wawrinka and it's right royal tussle with the latter having a length ol' injury break too. The Croat leads 4-6 6-4 6-3. Elsewhere, Ivan Ljubicic has just levelled up his match up against Ivo Karlovic, it's 3-6 6-3 there.

*Kohlschreiber 4-6 2-6 Nadal
Boom. Bosh. Two sets done. And to seal it, a better shot you are rarely likely to see. Rafael Nadal, a good yard or two outside the tramline, fires a forehand over and round the net to clip the line to seal a hold to love - and that may well be the match. Not a flicker of emotion of the face of the Spaniard, but if he's going to pull shots like that out of his locker, PK might as well get the car started now. Staggering fetch.
* denotes NEXT server

Kohlschreiber 4-6 2-5 Nadal*
With Svetlana Kuznetsova - next up in the Rod Laver Arena - watching on, Rafael Nadal takes another chunk out of PK's fighting spirit, battling back from 15-40 down to break when the German goes wide with a backhand. Clinical matchplay tennis from the Spaniard - that's three breaks from seven chances, compared to zero from nine to PK. Matador-esque.
* denotes NEXT server

*Kohlschreiber 4-6 2-4 Nadal
Well well well... is this a chink in the Nadal armour again? Cruising at 40-0 up, the Spaniard suddenly loses his forehand as he fails to get a couple of fine PK returns back in court. The German almost visibly swells in the arms and chest as an unreturnable backhand brings up his first break point of the set... and he pings a forehand return on the second serve into the net. Oomphf. Fear not PK, another wayward Nadal forehand gives him another go... oh my word! A sensational point looks to be heading the German's way thanks to a drop shot but a fetch-volley to end all fetch-volleys from Nadal saves it and he goes on to hold. Soul-wrecking.
* denotes NEXT server

"He's made of rubber this man Nadal. He somehow flicks them back and Kohlschreiber eventually just loses his patience."
John Lloyd on our BBC coverage

Kohlschreiber 4-6 2-3 Nadal*
A welcome simple hold for PK behind some heavy first serves. He's not out of this, the German, but he'll be seeking a change of fortune on those big points... Lest we forget, he wasted seven break points in that first set.
* denotes NEXT server

*Kohlschreiber 4-6 1-3 Nadal
PK steps in on the Nadal serve in an effort to pile on the pressure, but it pays few dividends as the Spaniard holds to 30. Still, far from routine, this, for the world number two. Turns out, by the way, we have yet more publishing problems. Cue teethmarks on my keyboard. Gnnnggg.
* denotes NEXT server

Kohlschreiber 4-6 1-2 Nadal*
As John Lloyd points out on our coverage, Rafael Nadal "is a human backboard. It must be soul-destroying". Soul-destroying it may well be, but Kohlschreiber is showing more mettle than a billionaire's Meccano set at the moment as he shrugs off Nadal battling his way back to deuce from 15-40 down to ping down an ace to secure a precious hold.
* denotes NEXT server

*Kohlschreiber 4-6 0-2 Nadal
Full house on show in the Rod Laver Arena but so far they are only getting glimpses of Rafa's consummate class. Those flashes are enough right now, though, and he holds easily to back up his break.
* denotes NEXT server

Kohlschreiber 4-6 0-1 Nadal*
Ouch - that's going to hurt PK, surely. The German strolls to 40-0 up on serve only to freeze a touch in the face of some brutal Nadal hitting and the second seed shows all his class and experience in securing the early break with five points on the trot.
* denotes NEXT server

0958: A little update from the other courts - having lost the opening set, Swiss 19th seed Stanislas Wawrinka levels things up against Croatian Marin Cilic 4-6 6-4. Ivo Karlovic, meanwhile, is serving for the first set at 5-3 against Ivan Ljubicic.

"It was an iffy kind of a set, really. Kohlschreiber had seven break points and didn't convert one, while it was OK from Nadal - nothing special but he got the job done."
John Lloyd on our BBC coverage

*Kohlschreiber 4-6 Nadal
Big 'VAMOS' from Rafael Nadal as he wraps up the first set in an hour and four minutes when PK goes long with a tentative forehand. Some really good stuff in that set from "Robbie" but Nadal still too strong for him. How does that bode for the man with a million nicknames?
* denotes NEXT server

"As well as he is playing, I just can't see Kohlschreiber making too much headway against Rafa today, the Spaniard is just too quick."
John Lloyd on our BBC coverage

"Enough of this tennis nonsense Sam, last year you kindly told us what you were wearing to play during your match over at Clayhall Park. Any chance?"
jeranberan, working very hard in Anglesey, via text
You see, this is the kind of memory powers I'm talking about. I salute you jeranberan, I salute you

Kohlschreiber 4-5 Nadal*
It's PK's turn to punch his way off the ropes as he twice denies Rafael Nadal break and set-points to hold when Nadal goes wide with a forehand.
* denotes NEXT server

*Kohlschreiber 3-5 Nadal
PK's backhand can be a thing of beauty, it really can, and he produces one to go 15-40 up that I'd like to frame and hang on my bedroom wall. A Rafa double fault and then a delightful drop shot earn PK two more break-back points, but Nadal - who is struggling a touch to deal with the German's early returns - displays all his bull-fighting qualities to secure a big hold. The Spaniard has saved seven break points in all now.
* denotes NEXT server

Kohlschreiber 3-4 Nadal*
PK might consider himself a touch unlucky to be a break down in this set, such has been the level of his tennis, but he has to hold off another Rafa brutaliser to hold serve to deuce and keep himself in this set. Meanwhile, StevenRajam, via my Twitter feed, tells me the ol' Philipp Kohlschreiber nickname game was covered by Piers Newbery at the French Open last year. I'm not sure if it's impressive or depressing that he remembers that, but in future I expect those knowledge levels on BBC content from all of you. Even you. Yes you.
* denotes NEXT server

*Kohlschreiber 2-4 Nadal
PK digs into his bag of tricks with a neat drop volley and forehand winner down the line to take Nadal to deuce, but the Spaniard responds with an ace out wide and serve-volley winner to hold.
* denotes NEXT server

Kohlschreiber 2-3 Nadal*
First opportunity, first break for Rafael Nadal and he of the freakishly big left arm already looks eye-of-the-tiger-esque.
* denotes NEXT server

"Or Nelson - as in PK?"
Conor, London via text

"Kohlio, the tennis rapper, ja ja ja?"
Marc, Stuggart via text

"How about "Sarge" as in 'Sergeant Phil-Ko'"
Gerry via text

0908: Now then, to celebrate the fact we have Rafa video, and given Kim Clijsters has flaked faster than a rich tea biscuit in hot milk, I'm going to go game-by-game for the Nadal-PK extravaganza. I know, I know... your excitement is too much. Fear not, I will be bringing you news of Cilic-Wawrinka and Ivo Karlovic-Ivan Ljubicic as well - I am just that good.

0902: Aaaannnddd... there we are. Blink-and-you-missed-it 6-0 6-1 victory for Nadia Petrova over Kim Clijsters and that was more comfortable than a Gizmo-hair cushion stuffed with cotton wool balls for the 19th seed. Clijsters herself barely had time to work up a sweat there and there will be no repeat of her shock 2009 US Open victory here. Elsewhere, we are on serve in the Nadal-PK/Kohl-train/Cabbage Clerk/Nat King Kohl and Cilic-Wawrinka matches.

"www.philippkohlschreiber.de deserves another plug. Still the most hilarious of tennis player websites."
Stuart, Edinburgh via text

0853: Nice suggestion, that, Rob (below) - although my immediate thought is to now refer to him as "Robbie", as in "Robbie Kohl-train" - ba dom boom boom - tish! Ahem, anyway, while Nadia Petrova breaks again to make it 6-0 5-1 against Kim Clijsters, Rafael Nadal and Cabbage Clerk get under way on the Rod Laver Arena. We'll have live video of that as soon as Clijsters-Petrova is done, which may or may not prompt a surge of support for the Russian, I don't know.

"How about the 'Kohl-train'?"
Rob, Wolverhampton via text

0846: Huge roar from the Hisense Arena as Kim Clijsters gets on the board with a love service game - making it 0-6 1-3 to Nadia Petrova. Not so much the start of a titanic comeback necessarily, but definitely a dip of a toe into the waters of respectability. Meanwhile, prompted by a text from Chris in Zurich, I checked out the literal translation of Kohlschreiber and it literally means "Cabbage Clerk" - is that right? If it is, that is genius.

0841: Nine games down... Kim Clijsters still to get on the board. The Belgian currently boasts three winners and 20 unforced errors to Nadia Petrova's 14 winners and three unforced errors - which tells its own story. Petrova looking a very safe bet for the fourth round on this form with her lead now 6-0 3-0. Cilic-Wawrinka on serve at 2-3, Rafael Nadal-PK yet to get going.

"Re: nicknames for Phillip Kohlschreiber, how about 'Phi-Kohl"... on second thoughts, maybe not."
Jack, Liverpool via text

0829: Make that a rather heavy sweat, then, as Kim Clijsters loses the first set against Nadia Petrova 6-0. The Russian looks more determined than an asthmatic ant carrying some heavy shopping out there. (Who doesn't love Blackadder? Classic). It's on serve in the Marin Cilic-Stanislas Wawrinka match on the Margaret Court Arena.

0824: Erm, you might want to consider getting a mild sweat on now Kim Clijsters fans - the 15th seed is a double break 5-0 down in the first set against Nadia Petrova now. Sluggish.

0819: Oh - and in addition to my 0805 entry, I can advise you that I have one of them there Twitter thingymajigs. Check me out all social media savvy. Why don't you all 'follow' me and we can all be twits together, like a big twit family of twits. Brilliant.

0814: Rusty start from US Open champion Kim Clijsters as she allows Nadia Petrova to bully her around the court and the Belgian slips to an early break. It's 2-0 to the Russian in that one, but the day is earlier than early so do not fret too much just yet Kim fans. Marin Cilic and Stanislas Wawrinka also under way, while Rafael Nadal is flexing his massive left arm on the Rod Laver Arena as he warms up for his Kohlschreiber match. I'm going to have to invent a nickname for Philipp Kohlschreiber - I can't be spelling that out all morning.

0805: And don't be shy with the ol' texts people - wherever you are in the world you can have your say on all things Australian Open (and otherwise, if it's interesting/funny enough) and I will make you web famous for 15 minutes. You have the power folks - impress me.

0800: Right now we have live video of Kim Clijsters v Nadia Petrova at the top of this page (UK users only) and on the red button, while sports extra will also bring you the latest on the wireless, before switching to Spain's number two seed Rafael Nadal against German 27th seed Philipp Kohlschreiber. Elsewhere, Marin Cilic and Stanislas Wawrinka are about to get under way and you know who is going to keep you on top of all the happenings from all three matches? That's right - me, Sam Lyon, the most handsome man this side of desk three in room 5040 in television centre. Oh, hold on, someone else is coming to sit here now...

0754: And the hits just keep on coming, this time from the Rod Laver Arena, as Argentine fourth seed and last year's US Open champion Juan Martin del Potro finally finishes off brave German Florian Mayer 6-3 0-6 6-4 7-5. Del Potro had to see off two break-back points in that final game but saw the match home with an unreturnable serve that has got him out of jail more than once in this tournament so far. Decent stuff from both players in that match, but JMDP will surely have to up his game as the event progresses - he faces Marin Cilic or Stanislas Wawrinka next up.

0747: My first order of the day is to bring you news of Andy Murray's fourth round opponent - and it will be giant American John Isner following the 33rd seed's 6-3 4-6 7-6 (7-4) 7-6 (7-5) defeat of French 12th seed Gael Monfils. Impressive stuff from the big-serving 6'9" Isner and Murray might just find his mettle tested in that one.

0745: Poor ol' Ornstein and Ashenden - they were bright eyed and bushy tailed while Andy Murray was kerplunking Florent Serra to reach the fourth round, but they've now hit the wall faster than a crash test dummy as the need for sleep donkey kicks its way into their souls. It is left to me to chat you through the latter stages of day five, and there's still plenty of entertainment for you to cast your gaze upon as you do your utmost to welcome the weekend in as we all know it should be done - avoiding work. Give this page a manual refresh to magically make my name appear at the top if you don't mind, it makes my mum ever so proud.

0735: And, believe it or not, there's more to come. Rafael Nadal faces Philipp Kohlschreiber, Kim Clijsters is up against Nadia Patrova and Marin Cilic plays Stan Wawrinka. So without further ado I'm going to pass you into the safe hands of BBC Sport's Sam Lyon. Be kind to him and enjoy the action!

0725: An action packed morning has seen Dinara Safina end the dreams of British number one Elena Baltacha, Justine Henin come from a set down to beat Alisa Kleybanova and Jelena Jankovic fall to Alona Bondarenko. On the men's side, Andy Roddick saw off Feliciano Lopez, Fernando Gonzalez ousted Evgeny Korolev and Britain's Andy Murray eventually eased past Florent Serra.

British number one Elena Baltacha on Twitter: "Come on Del Porto xx"

0710: What happened to Juan Martin del Potro in the second set of his third-round match against Florian Mayer is anyone's guess. Fatigue following his five-setter against James Blake on day three? Anyhow, bagel eaten and he's back on track after converting his only break point to wrap up the third set and take a 2-1 lead on Rod Laver Arena.

0700: So Britain's finest is into round four of the Australian Open for the third time. Standing between Murray and a maiden quarter-final appearance at Melbourne Park will be either John Isner or Gael Monfils. American Isner and Monfils of France are out on Margaret Court Arena as we speak and Isner is leading by two sets to one.

0650: "It was good," Murray tells BBC Sport. "The first set was closer than it needed to be. To win in straight sets on a day this hot is really good. My back is a bit stiff - the courts here are sticky and a change of direction can hurt the lower back. I've had trouble with it in the last couple of years here but it's nothing out of ordinary."

Murray 7-5 6-1 6-4 Serra
Team Murray will be ecstatic with the way the world number five served towards the end and a couple of aces set up a couple of match points. An eye-catching rally ensues on the first of those match points, with both men leathering groundstokes from the baseline and feathering drop shots at the net. Murray triumphs with a majestic sliced backhand that loops over the net and dies before Serra can reach it. The crowd serenade the British number one, who has now won all three of his matches at the 2010 Australian Open in straight sets. Game, set and match Murray.
* denotes NEXT server

*Murray 7-5 6-1 5-4 Serra
Serra deserves credit for the way he's dug in but the game is nearly up. Murray produces a couple of gorgeous winners but also makes a couple of errors. He'll now serve for the match.
* denotes NEXT server

Murray 7-5 6-1 5-3 Serra*
There's no catching Murray now, he waltzing into the fourth round. Serra will now serve to stay in the match.
* denotes NEXT server

0630: "It's all one way traffic now though i don't think Murray has stepped it up all that much since the first just broken the will of Serra who just seems to have run out of ideas. I'd still like to see Murray get his first serve percentage up into the 60s at least. He will struggle against the top players serving like this on matter how many irretrievable shots he manages to somehow get back over the net."
From Nik in Cambridge via text

*Murray 7-5 6-1 4-3 Serra
Serra's going to make Murray work for his victory but physically he looks pretty much spent. although he holds serve, the effects of two five-set matches this week are definitely starting to show.
* denotes NEXT server

Murray 7-5 6-1 4-2 Serra*
Hisense Arena is pretty quiet now; the crowd know this match is nearing its end. both men seem content to simply concentrate on winning their service games while letting their opponent tick off his. Not the best plan for Serra, who's two sets and a break down.
* denotes NEXT server

*Murray 7-5 6-1 3-2 Serra
The baseliner from Bordeaux enjoys a rare breeze of a service game. Murray still a break up and perhaps he's keen to concentrate on his serve rather than putting all of his energies into another break of serve.
* denotes NEXT server

Murray 7-5 6-1 3-1 Serra*
Where did that come from? Murray drops his level, loses a bit of discipline and hands back a break. No real sign of a Serra fightback, just Murray losing his focus a little.
* denotes NEXT server

0620: Reigning US Open champions Juan Martin del Potro, seeded fourth, the first set of his match against Florian Mayer 6-3 but has lost the second 6-0. Perhaps he's cream crackered from his five-set epic against James Blake in round two.

*Murray 7-5 6-1 3-0 Serra
Clearly annoyed by a Serra's decision to call for the trainer and spend five minutes receiving treatment on his elbow after an innocuous fall, Murray blasts his way to a second break this set. The end is surely in sight.
* denotes NEXT server

Murray 7-5 6-1 2-0 Serra*
It's almost as if Murray's going through the motions of a practice session. His face is a picture of calmness and it's allowing him to play relaxed and ruthless tennis without fear of the repercussions. Serra appears resigned and is making no impression on the Murray serve.
* denotes NEXT server

*Murray 7-5 6-1 1-0 Serra
Serra drops to his knees in despair after relinquishing an early break in what could well prove to be the final set. Murray's playing well but he's also playing within himself. A 27th unforced error from Serra hands Murray the game and this match might not last too much longer.
* denotes NEXT server

Murray 7-5 6-1 Serra*
Love service game. Serra looks deflated, pumping a backhand into the net on set point. Murray's buzzing, Serra's flagging.
* denotes NEXT server

*Murray 7-5 5-1 Serra
How would you like a double break for breakfast my friends? That's exactly what Murray's just given you and he did it in style. Serra gets to game point but wastes a couple of chances to close it out and Murray comes roaring back. A delicious drop shot proceeds an incredible well-judged backhand lobbed that drops inside the baseline and hands Murray the break.
* denotes NEXT server

Murray 7-5 4-1 Serra*
Murray seems far more focused at the moment and it's allowing him to dictate play. He's keeping things simple and then reeling off winners when he gets any hint of an opening. Serra looks to be trying too hard to reel his opponent in and it's hampering his chances - the unforced error count is on the rise.
* denotes NEXT server

0555: "Bit of Jekyll and Hyde here from Murray. We've had some absolutely sublime tennis at times but equally at times he's looked tame. All credit to Serra though, he's played out of his skin. C'mon Andy!!!"
From Andrew from Newcastle via text

*Murray 7-5 3-1 Serra
The crowd is on its feet as Murray comes flying into the net to retrieve a drop shot and flick a delightful forehand winner across the court. He engineers a break point and gets the break when Serra goes long.
* denotes NEXT server

Murray 7-5 2-1 Serra*
When Murray's first serve clicks into gear he looks a serious proposition. On this occasion an ace out wide allows him to tick off another service game and put the pressure back on the shoulders of his opponent.
* denotes NEXT server

*Murray 7-5 1-1 Serra
Touche. Serra holds comfortably, although the sudden bright sunshine seems to be troubling Frenchman's vision a touch.
* denotes NEXT server

Murray 7-5 1-0 Serra*
Murray makes authoritative start to the second set as the sun comes out at Melbourne Park. The Scot's first serve percentage stands only 48% but Serra couldn't get close to him in that game.
* denotes NEXT server

*Murray 7-5 Serra
"The great players can raise their level when they need to and that's what Murray did," says John Lloyd on BBC Two. There's no sign of a back problem as Murray cranks up the intensity and breaks Serra to take the first set. The 22-year-old seals the set with a forehand rammed into the feet of his opponent, who can only find the net.
* denotes NEXT server

0535: Not so good news for the Brits. Sarah Borwell and her American partner Raquel Kops-Jones lose Gisela Dulko and Flavia Pennetta 7-5 6-2.

Murray 6-5 Serra*
You can't help but admire the way Serra has turned this around. If Murray is injured he's not going to find life easy against an opponent who seems keen to work him from side to side, short and long. Murray fights his way through the game and then shuffles to his seat for the changeover.
* denotes NEXT server

*Murray 5-5 Serra
Is Murray injured? The world number five cringes with discomfort as he jars his back. Worrying gimpses to his support team in the stands on Hisense. He's moving gingerly as Serra holds comfortably.
* denotes NEXT server

Murray 5-4 Serra*
An inside out forehand from Serra leaves Murray chasing shadows and gives the Frenchman 0-40. The Scot is broken back after a double fault.
* denotes NEXT server

*Murray 5-3 Serra
You won't see a finer running forehand pass all tournament. Serra looks fairly comfortable before Murray races to retrieve a ball that looks to have beaten him and flashes it passed his stunned French opponent. The Scot follows it up with another forehand winner and then slashes a crosscourt backhand winner to break serve and is now within a game of the opening set.
* denotes NEXT server

Murray 4-3 Serra*
The speed of Murray's second serve drops worrying low and Serra takes advantage to level at 30-30. Murray is suddenly under pressure but her scrapes through to keep his nose in front.
* denotes NEXT server

0515: Another result is in from the men's singles. Fernando Gonzalez beats Evgeny Korolev 6-7 (5-7) 6-3 1-6 6-3 6-4 to reach round four of the 2010 Australian Open.

*Murray 3-3 Serra
Impressive recovery from Serra and this match is suddenly looking evenly balanced. Murray took the first three games and Serra has taken the second three. The Frenchman has injected plenty of pace into his groundstrokes and playing some really aggressive tennis. "Andy's not having everything his way," says Murray's close friend and Britain's top doubles player Ross Hutchins on 5 live. "Serra's taking the match to him and starting to dictate things."
* denotes NEXT server

Murray 3-2 Serra*
Out of nowhere Serra breaks back. The man from Bordeaux lashes a couple more forehand winners to set up a break point and Murray puts a volley into the tramlines. The fairly noisy Murray fans are silences. We're back on serve.
* denotes NEXT server

0505: Back on Rod Laver, Andy Roddick beats Feliciano Lopez 6-7 (4-7) 6-4 6-4 7-6 (7-3) to reach round four of the 2010 Australian Open.

*Murray 3-1 Serra
To quote Jonathan Overend on BBC Radio 5 live, "Serra doesn't know what's hit him". Murray engineers two break points but goes wayward on both and we're at deuce. Another three break points come and go before Serra eventually comes up with a couple of neat forehand winners to put a game to his name.
* denotes NEXT server

Murray 3-0 Serra*
An inside-out forehand winner sets the tone for a hold to 15 for Murray. French number 10 Serra doesn't look to be in Murray's league but there's a long way to go yet.
* denotes NEXT server

*Murray 2-0 Serra
These two have never met each other before. Serra has never been past the third round of a Grand Slam tournament and has lost each of his last eight matches against top 10 opposition. He has also played 10 sets to Murray's six this week. Despite all that Serra looks set to level the match with a couple of fizzing winners. But Murray cranks up the intensity and forces two break points, the second of which he takes when Serra pushed a forehand long. Murray has an early break and looks extremely sharp.
* denotes NEXT server

Murray 1-0 Serra*
Wow. Murray opens the match with three successive booming aces before Serra fires a forehand long to concede a quick-fire game.
* denotes NEXT server

0445: You can watch Murray v Serra live on BBC Two and here on the website - with game-by-game text commentary - or listen live on 5 live switching to 5 live sports extra at 0530 GMT. Here we go!

0440: A fair bit later than expected after Justine Henin's three-set duel with Alisa Kleybanova, Britain's Andy Murray and Florent Serra of France are soon to get started on Hisense in round three of the men's singles.

5 live's Steve Rudge on Twitter: "Murray match about to begin on BBC2 and 5live (we will swap to 5live Sports Extra at 0530GMT)."

0433: Awaiting Henin in round four is fellow Belgian Yanina Wickmayer, who sees off Sara Errani 6-1 6-7 (4-7) 6-3.

0427: Magnificent from Henin. The 5ft 5ins right-hander applies huge pressure on the Kleybanova serve in game six of the decider and it pays dividends as she breaks again. She completes the victory by sending her Russian opponent wide and then racing to the net and angling a forehand volley into open court. Henin beats Kleybanova 3-6 6-4 6-2 to reach round four of the 2010 Australian Open.

British number one Elena Baltacha on Twitter: "I'm disappointed I didn't perform the way I know I could of but Safina played a great match! Thankyou to everyone for their support xx"

0422: An end looks to be in sight for Henin after she breaks Kleybanova straight back and then holds serve for a 5-2 lead. The little Belgian has looked a little rusty on serve today but her court coverage and shot selection has been second to none in the second and third sets.

0420: "What's happened to Lopez's serve? He had 14 aces I the first set but only half that in the following 2 sets combined. He needs to step it up again to have a chance against Roddick."
From Katie in London via text

0416: Talk about commentator's curse. Henin is playing some quite beautiful tennis but Kleybanova is fighting for her life and gets her reward by breaking back and we're now back on serve in the decider. Andy Murray against Florent Serra follows this match on Hisense.

0410: A-Rod fans will be delighted to learn that their man has taken the third set for a 2-1 lead against Feliciano Lopez. Errani is a break up against Wickmayer and Gonzalez, 2-1 down against Korolev, is serving for a 4-1 lead in the fourth. Britain's Sarah Borwell and her American partner Raquel Kops-Jones have just got started against 13th seeds Gisela Dulko and Flavia Pennetta in the women's dubs.

5 live's Alastair Eykyn on Twitter: "Biggest upset today - Alona Bondarenko bts Jelena Jankovic... now she's wandering entirely anonymously thru garden square. Ah fame..."

0400: Henin is pumped out there and looks to be heading for victory. Then again, that's what I said about Kleybanova at this stage in the second set. Henin's muttering to herself just like in the old days but looks far more relaxed than in years gone by. She's raced into a 3-0 lead in the final set.

5 live's Jonathan Overned on Twitter: "Five mins ago I was about to send a tweet saying Henin was a set and 4-1 down, except she held on, and then broke and the comeback's on!"

0345: Get your Union Jacks out. Laura Robson continues her 16th birthday celebrations with victory in round two of the women's doubles. Robson and Australian partner Sally Peers beat 12th seeds Chia-Jung Chuang and Kveta Peschke 6-3 6-4. Robson was born in Melbourne so could claim to have home advantage, but she insists she's very much a Brit and we'll take her. The young left-hander holds her nerve to serve out the match and secure a place in round three.

0345: So Henin's tournament is alive and kicking once again but what else is going on around Melbourne Park? Roddick and Lopez are one set all and 3-3, Errani bounced back to win the second set against Wickmayer, Korolev is 4-1 up on Gonzalez in the third and Kirilenko has taken the opening set against Vinci.

0340: John McEnroe once described Justine Henin's backhand as the best in tennis - men's or women's. During the Belgian's 20-month absence, the sport has been a lesser place without that backhand. It sets up two set points against Alisa Kleybanova and she takes the set when her Russian opponent double faults. One set all.

0339: By the way, there is also live audio of Murray against Serra on BBC Radio 5 live sports extra.

0335: BBC Sport's Mark Ashenden is a man of many talents. Fresh from his Baltacha-Safina reporting duties, and calmed down after our well publicised technical problems, he's only gone and rustled together a photo gallery of today's action.

0330: Just to remind you, Andy Murray against Florent Serra follows Henin and Kleybanova on Hisense. You can watch the match live on BBC Two and this website. Henin saw a couple of break points go begging for a 5-3 lead in the second set and is now serving for a 5-4 lead. Henin, remember, is a set down.

0327: "Incredible battling from Justine in the 5the game of the 2nd set. Possibly a decisive game in this match. Hopefully she can live up to her comeback queen nickname now. C'mon Henin."
From Will in Cambridge via text

0320: Fancy some scores on the doors? Henin has moved 4-3 ahead of Kleybanova while Roddick and Lopez are still slugging out the first game of the second set. Wickmayer, who cruised through the first set against Errani, has come from a break down to level the second set at 5-5 and Gonzalez has just levelled his match against Korolev at one set apiece. Kirilenko and Roberta Vinci are 5-5 in the first set.

0317: There I was writing off Henin... she's only gone and secured the break back against Kleybanova. The Belgian now serving at 3-3.

0315: Plenty of fist-pumping from Roddick on Rod Laver. He takes the second set against Feliciano Lopez to level at 1-1.

0310: "C'mon Justine, draw deeply from the well of your match experience and bring on that magical Henin brio!"
From dannycs in Co. Down via text

0305: The technical problems here have been causing all sorts of strife. But Britain's Laura Robson her partner Sally Peers have lifted the mood by taking the first set of their second round doubles match against 12th seeds Chia-Jung Chuang and Kveta Peschke. The Brit-Aussie duo are also a break up in the second.

0300: It looks as though "Juju" could be on her way out. Kleybanova breaks the diminutive Belgian in game one of the second set and then holds serve for 2-0. Henin makes no mistake in game three but she's massively up against it. Many backed Henin to come out of retirement and triumph at Melbourne Park . Such hopes could soon be dashed.

0251: I'm not sure who's more angry - you lot at being cruelly deprived of our coverage or us lot at not being able to provide you with that coverage... So what did you miss while we were away? Andy Roddick and Feliciano Lopez exchanged breaks of serve before the Spaniard took the opening set on a tie-break. Comeback queen Justine Henin went a break down early doors against Alisa Kleybanova, who went on to serve out the first set. There were better fortunes for another Belgian as Yanina Wickmayer stormed into a one-set lead against Sara Errani. And Evgeny Korolev came back from a break down against 11th seed Fernando Gonzalez to win the opening set on a tie-break.

0248: Please accept my sincerest apologies for the delay. We've been experiencing severe technical problems.

Bob Bryan on Twitter: "Been following @clijsterskim around the breakfast buffet. Kim's mastered the breakfast of champions and blueberries seem to be the key."

0152: I nearly fell off my seat when I saw Jankovic finished with 40 unforced errors. Bondarenko made only 24 and 21 winners to Jankovic's 13. A first serve percentage of 81% is mightily impressive from the Ukrainian. I love stats. Bondarenko will play the winner of Jie Zheng and Marion Bartoli in round four.

0150: "Late night uni work to finish and the tennis text as an ideal companion. Unlucky bally but come on andy!"
From James at Warwick Uni via text

0146: Eighth seed Jelena Jankovic loses 6-2 6-3 to number 31 seed Alona Bondarenko of the Ukraine. Worthy of the shock result graphic? No doubt the Serb will complain of injury, heat exhaustion or some other physical ailment.

0145: Lopez has levelled at 1-1 in the opening set against Roddick, although both men have had a break point on the other's serve already. Actually, Lopez has just made it 2-2 with a love service game. Over on Hisense, Bondarenko has moved to within a game of victory over eighth seed Jelena Jankovic.

0135: And while things are relatively quiet, why not have a read of our report on Baltacha's defeat by Safina . Courtesy of BBC Sport's Mark Ashenden.

0130: We've still got a couple of hours to go until British number one Andy Murray takes on France's Florent Serra, but in the meantime there's plenty of good action to keep us occupied. What's going on around Melbourne Park right now, I hear you ask. Well, seventh seed Andy Roddick has taken the opening game of his third round match against Feliciano Lopez on Rod Laver and we could have a shock on Hisense, where eighth seed Jelena Jankovic is a set and a break down against Alona Bondarenko.

0120: "Maybe next year Bally. All down to Muzza now can he go all the way this year ? Give us some up arrows come on Muzza"
From Martin in Daventry via text

0110: "I'm very pleased with my game today, very satisfied," says second seed Safina after her 57-minute victory. World number 83 Baltacha was completely outclassed but could hardly have wished for a better start to her year. Two impressive victories and defeat to a genuine contender for the title. Not bad going from the Scot.

Baltacha 1-6 2-6 Safina
Rather predictably, Safina wraps up a comfortably victory. She comesto the net to dispatch a cross-court forehand winner to go 30-0 up before Bally replies with an unreturnable forehand of her own. Bally nets a forehand to give Safina two match points and she seals victory with a stunning forehand winner that lands on the baseline. Game, set and match Safina.
* denotes NEXT server

Baltacha 1-6 2-5 Safina*
Serious pressure from Safina and Baltacha buckles. The British number one nets an easy groundstroke to give Safina 0-30 and then double faults- her fourth of the match - to make it 0-40. The 23-year-old from Moscow shanks a forehand into the tramlines and then goes long to waist her first two break points. But Bally then puts a backhand wide and is broken for the second time in the set. Safina, according to John Lloyd, is playing tournament-winning tennis. But can she keep it up?
* denotes NEXT server

*Baltacha 1-6 2-4 Safina
Well, John, it seems she's already beginning to make those double faults. Safina relinquishes a 40-0 lead, double faulting on her third game point as Baltacha forces deuce. But an ace gives Safina advantage and then Baltacha goes long to concede the game.
* denotes NEXT server

John Lloyd on BBC Two: "Baltacha is going to have to hope Safina goes cold. But at the moment she's red hot. Safina is serving very well but the question is will she do that when she comes up against players inside the world's top 10 or will she begin to make double faults like we've seen in the past?

Baltacha 1-6 2-3 Safina*
Laboured yet vital hold for Bally. Rod Laver Arena is about three-quarters full and the crowd appreciate the Briton's efforts. She may not last long but she's going to go down fighting.
* denotes NEXT server

*Baltacha 1-6 1-3 Safina
The temperatures are hotting up in Melbourne and Dinara Safina is fire. The second seed takes her winners count to 13 by wrong-footing her Scottish opponent with a laser-guided forehand. Safina the serves out the game with a huge ace. I remember watching Safina on the practice courts at Wimbledon last summer and she couldn't serve for toffee. Suddenly it looks though she has one of the most dangerous serves in women's tennis. I doubt it will continue all tournament but it's happening for the Russian today.
* denotes NEXT server

0050: "I fear Baltacha will be off court soon if she continues to serve so badly, she can't hit a 1st serve in to save her life - I'm surprised if stats are even that good!"
From Tony Dapony in Edinburgh via text

Baltacha 1-6 1-2 Safina*
And there I was thinking Bally was about to launch a heroic comeback to take the second set. Well, she may yet. But a double fault on break point down - for the third time today - sees the British number one go a break down. I hate to say it but the way Safina is playing this could be over very shortly.
* denotes NEXT server

*Baltacha 1-6 1-1 Safina
Safina responds with a love hold of her own. Fans of the Russian will be delighted, and possibly surprised, to hear she has only made one double fault so far. Most uncharacteristic.
* denotes NEXT server

Baltacha 1-6 1-0 Safina*
What a tremendous start to the second set from Bally. The British number one committed 12 unforced errors in losing the opening set but responds with a hold to love, sealing the game with an unreturnable serve out wide. Cool, calm and composed. Just what the doctor - or coach Nino Severino - ordered.
* denotes NEXT server

0035: "I think Baltacha's aim today should just be to give a good account of herself. If she manages to take a set, even push Safina then it's all a bonus. Regardless i feel she can be proud of her achievements this week."
From Michael in Letchworth via text

*Baltacha 1-6 Safina
Facial expressions would suggests Baltacha knows it's all going a bit Pete Tong out there. She actually takes the initiative with a fine winner and lets out a huge yelp of "c'mon!". But Safina levels at 30-30 with a rasping ace, brings up set point with a superb drive volley and takes the set when Bally nets a backhand.
* denotes NEXT server

Baltacha 1-5 Safina*
You can't expect to beat a player of Safina's class with a first serve percentage of 50%. Bally really isn't firing out there. For the second time in as many games she double faults when facing a break point and Safina will now serve for the set.
* denotes NEXT server

*Baltacha 1-4 Safina
Oh how Safina would dream of playing every service game like that one. Baltacha can't get close to the world number two's thumping groundstokes and is now closing in on the opening set.
* denotes NEXT server

Baltacha 1-3 Safina*
If Bally's first service game was nervy, her second was very, very nervy. She's making numerous unforced errors on both forehand and backhand sides and her first serve is not firing. The Brit double faults to hand Safina another break of serve. Oh dear.
* denotes NEXT server

*Baltacha 1-2 Safina
As we've seen so often in the past, Safina is her own worst enemy. She opened up with such a confident service game but Baltacha applies a bit of pressure and the Russian can't cope. The British number one has the break back and we're back on serve. Coverage up and running on BBC Two.
* denotes NEXT server

Baltacha 0-2 Safina*
A nervy opening service game from Baltacha. Safina applies precious little pressure but still does enough to secure an early break of serve due to a succession of unforced errors from the British number one. The crowds finally starting to stream in. Bally needs to get it together.
* denotes NEXT server

*Baltacha 0-1 Safina
Baltacha has looked in fine form so far at Melbourne Park, winning each of her opening two matches quite comfortably. But, lets face it, nobody is expecting her to beat Safina. That said, she spoke confidently of her chances coming into the match and makes a steady start on Rod Laver. Safina nets to give the British number one 0-15 but a couple of unforced errors from Baltacha hand her opponent two game points and the Russian gets her nose in front with a well-timed winner.
* denotes NEXT server

0010: Safina to serve first in front of a scattering of spectators on Rod Laver.

5 live's Jonathan Overend on Twitter: "Baltacha hit at 930am on RLA with Nigel Sears, Nino Severino and Kirk Bowyer. A good team! Obligatory photo after, infront of ARoddick"

0005: The players are out on Rod Laver Arena and Safina has won the toss. As always, the 5 live team will be giving regular updates on Up All Night and later I believe there will be live commentary of Andy Murray against Florent Serra. Murray will be live on BBC 2 from approximately 0330 GMT and streamed here on the website.

0000: It pains me to remind you that the last time Safina met a British number one in a Grand Slam tournament - the lovely Anne Keothavong at the 2009 French Open - she won 6-0 6-0.

2355: But first up it's British number one Elena Baltacha against world number two Dinara Safina. Can she? Will she? Get involved in the chat by Tweeting me or via text on 81111 (UK) and +44 7786200666 (worldwide).

2352: Over the course of the next eight hours or so we'll be feasting over the likes of Rafael Nadal, Juan Martin del Potro and Andys Murray and Roddick, Kim Clijsters, Justine Henin, Sveta Kuznetsova and Jelena Jankovic.

2350: G'day and welcome to day five of the 2010 Australian Open. A quick glance at Friday's order of play suggests this has all the makings of an absolute belter.