Results: John Higgins (Sco) 4-6 Ding Junhui (Chn)
72-17 (71), 39-74 (74), 73-47 (73), 69-22, 10-73 (54), 0-135 (135), 87-16 (62), 1-96 (96), 32-81, 74-83.

Graeme Dott (Sco) 5-6 Stephen Lee (Eng)
79-0 (78), 107-5 (107), 68-56, 28-61, 0-80 (80), 66-8, 78-31 (63), 23-77, 22-60, 31-92, 61-64 (64)

606: DEBATE Your views on Wednesday's action

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By Tom Fordyce

2307: He's done it - Lee clears up to snatch a fine comeback. Dott is stunned. What a fight-back.

2304: Lee nails the tough red. If he stays steady here, the match is head. Dott can't even look.

2300: A decent break, that's what - he's up to 15, with only one of the three remaining reds looking tricky.

2254: Or is he? With Lee smelling blood, Dott raises his game from the depths. With the patience of a monk he builds a break of 61, only to go a little steep on the black. After considering the shot for an age, he plays safe. What can Lee produce in response?

2244: Sure enough, the break gets away from him before it has really begun. Lee comes back after a Dott miss and polishes off for the frame. It's 5-5, and Dott is suddenly on the ropes.

2240: What a miss from Lee - the easiest of reds to the bottom left, and he wasn't even close. Suddenly Dott has another glimpse, although the way he's been playing in the last few frames nothing is guaranteed.

2235: Lee's the man on the move here - he's now 40-14 up, and if he can disturb a queue of reds behind the pink he'll be in super shape to level this match up.

"What I am watching is a totally out-of-sorts Lee playing absolutely rubbish and Dott can't even put him away. This is very poor snooker." nigeweir on 606

2226: Dott misses again, and Lee staggers across the line. 5-4, and Dott is in danger of throwing this away.

2020: He doesn't take it. Dott is struggling to sink anything at the moment. The man who misses fewer will win this match.

2215: Dott blinks in disbelief as a screw-back from a simple red sends the white whistling into the centre-right pocket. Lee plods to the table with the reds at his mercy, but - leading 36-18 - blows an easy black to the bottom right to gift Dott a wonderful chance.

2209: "This is hard, grinding match snooker," says BBC commentator Clive Everton. He's not wrong - it's that attractive.

2201: Dott stays safe after nibbling into a 12-0 lead, turning down the chance of a risky thrash into the pack to roll the cue-ball onto the bottom cushion.

2148: The frame is Lee's after another exchange of ragged errors. Dott had his chances but blew them all, and he's not looking too perky as he trudges off for a courtesy break.

2143: Lee can't believe it - he nails a super red into the centre right, only to come off the baulk and roll all the way down to the bottom cushion to nudge the black into the left-hand corner pocket. Dott must be stunned too - with the table at his mercy, he misses a very downable red to the top left and lets Lee back in.

2134: He takes his time, but that's the Dotty way - and as the blue and pink slip down, he takes a 5-2 lead. Can Lee come back from that?

2125: Chance here for Dottuci. A lucky cannon after a cheeky red leaves him amongst the balls and just two points behind. Hold onto your seats.

2118: Big misses from both players, and the standard is dropping. Lee's only landed 26% of the long ones he's had a pop at.

2112: Dott switches sides on his break-off, mainly because every other break has left Lee with a pottable red, but makes exactly the same mistake. Lee rattles up 21 but then misses a red to the bottom left corner, only for Dott to let the cue-ball from his next pot drift into the bottom right pocket. Sloppy.

2103: Lee is in all sorts of trouble with this snooker. He misses by a mile and is called for two fouls before finally escaping. Another mistake under pressure puts Dott back on the table, 59 ahead with 67 on the table, and he stays steady to move 4-2 ahead.

2057: With 43 on the board, Dotty decides to play safe, and leaves the cue-ball hidden away behind the brown.

2051: Dotty's battling back here - the reds are well spread and the black's dropping like a polished stone. 22 on the board, and the door's wide open.

2044: Lee is back - official. He's 74 ahead with just 54 left on the table, and at 80 a missed red means nothing. 3-2, and the game is back in the balance.

2039: We're back, and Lee looks like a man refreshed. He seizes his first chance and is up to 44 when a cannon into the pack leaves him with a choice of three tough reds.

2018: He blows it - but then so does Lee. Both players struggling here. When Dott misses again, he concedes the frame. 3-1 at the mid-session interval.

2010: Lee sludges on to 61, but then misses a tough red to leave Dott with a chance - if he clears up here with three reds standing, the frame will be his.

2003: The break doesn't last long - a mere 12 - and Lee works his way up to 29 before the safeties begin. Needs some confidence, this boy - he's all grimaces and frowns.

1955: Lee breaks and immediately leaves a long red into the bottom right for Dotty. The skinny Scot has a pop and misses, but Lee fails to see off an easier one and Dott gets busy in the blink of a lizard's eye.

1949: A mistake on an easy red lets Lee in for another chance, and he nibbles into a 56-45 lead until a tricky red into the bottom right wriggles free. Dott then goes too straight on the pink at 62-56 - can he still sink it? He can, you know - it's 3-0!

1942: The Dottmeister is the first on the board, compiling a steady 45, before Lee finally fires up his engines with 28. But he's careless with his postion off a blue and misses the subsequent red into the bottom right.

1934: Super performance from Dotty, rattling up a break of 107. Lee's only potted one ball in the match so far, and he's a picture of perturbation.

1927: Dott bides his time and then eases into action as Lee slips up. With the reds well set he builds through 37 and has a solid chance at a 2-0 lead.

1922: Early chance for Lee in the second frame as he nails a long red down the rails, but the cue-ball dribbles behind another red and he's forced to play safe.

1915: Dotty's the first to get busy, easing his way through the balls to squeeze out the first frame. Lee sits motionless in his chair and then suddenly makes the sort of face you'd expect if he'd just been told that aliens had landed.

1905: ...and they're off. Cagey early on, and the most interesting thing so far is the difference in girth between our two players. You could fit two Dotts into one Lee and still have room for a couple of surf-boards.

1850: Mere moments to go at Wembley before our rip-roarer of an evening match gets underway. Dott v Lee - mouth-watering.

1743: Ding's almost there - a wonderful blue drops, and he needs just the pink. He settles over it, the cue slides through - and down the hatch it goes. Ding is through to the quarter-finals, and the world champion is out. My giddy aunts.

1740: Now it's Higgins' turn to struggle, clattering into the black twice after being snookered on the brown. Suddenly Ding is within six with just brown, blue, pink and black left on the baize.

In other news, top referee Eirian Williams has been cornered by BBC Sport's Phil Harlow this afternoon, answering the questions you have been posting on 606. How close do refs get to players, how do they decide who officiates in the final and which game does Williams wish he had reffed? It's all there.

1737: Ding drains a sensational green after fluking the yellow, only for a lusty brown to keep its head above water as he piles on the backspin.

1732: Ding is having a nightmare - he's called for three consecutive fouls as he attempts to go from baulk to bottom cushion and back. The table seems to be off, sending the ball drifting off-line, and Ding gesticulates angrily at the cloth. He's 23 behind with 25 remaining. The frame enters its 31st minute.

1726: Ding has a simple yellow to push on for the frame and match, but somehow contrives to miss it. The lad's distraught. The tension is melting brains out there.

1722: The tension has turned Ding's cue-arm to blancmange - he blows his own easy red, only for Higgins to then do the same. Ding drops a tricky red and then traps Higgins in a brute of a snooker.

1717: With his break up to 39, Higgins loses control of the cue-ball after sinking a straightforward pink. He's forced to joust at a much tougher red, misses it and winces. Ding cannot believe his luck.

1712: Ding slides home a red but can only watch in horror as the white slips through the tiniest of gaps between the other reds to drop into the centre left pocket. Higgins could be in here.

1707: Where will this one go next? The reds spread far and wide from the break, and Higgins sends the white back up to cosy with the baulk cushion to pile the pressure on his young opponent.

1700: An epic frame ends in victory for Ding after Higgins blows two great safety chances and then wobbles a monster of a long brown between the jaws. Ding now just one frame from a sesnational triumph.

1654: Higgins drops a red but misses the follow-up pink. At 23-61, he's staring into the abyss.

1649: More methodical from Ding, inching his way up to 61 before the cue-ball lodges awkwardly between two of the three remianing reds. He plays safe, and Higgins stays alive.

Saj Chowdhury, the BBC website's 'voice of snooker', is lost for words at the drama away from the green baize after learning that his beloved Newcastle United FC are welcoming Kevin Keegan back as manager.

"I'm speechless. It's like Top Gun, where they expect him to come back, but I'm not sure whether it will work. I don't think it's a good move," he said.

1643: Safety follows safety - and then Ding strikes.

1635: Higgins flukes a red to the middle, but the cue-ball snuggles against the pack. He's forced to play for the green but misses and is called for a foul. Ding then forces two more errors to nibble into a 13-1 lead.

1630: And won it is - this incredible match is even Kirk Stevens again. You might even call it a Ding-dong battle. What an afternoon.

1622: Heartbreaker for Higgins - a red slides down the right-hand cushion and skips out of the jaws to let Ding in. A clever cannon off the black with the break at 37 opens up the pack, and the frame is there to be won.

1615: Disaster for Ding as a cruel kick sends the cue-ball hurtling up the table. Higgins seizes the skinniest of chances and charges through the rest of the frame to edge back in front. The pendulum swings again.

1609: A red clatters round the jaws, and Ding glides back to the baize with a deficit of 62 staring him in the face. At first glance there's nothing open to him, but he thumps a sensational double into the centre left and squeaks home the following black to kick-start the chase.

"Snooker does not get better than this." nigeweir on 606

1603: A monstrous long red, that's what. Extraordinary. With the flinty-eyed determination of a true world champion, Higgins begins to build. 55 and counting.

1559: Marvellous work from the human rollercoaster that is Ding - a rollicking break of 135 stuns the spellbound Wembley crowd, and we're level at 3-3. What can Higgins produce now?

1555: Ding's the first on the board again, rattling up a rapid-fire 51 and counting. All about momentum out there, and suddenly Ding's parked himself in the driving-seat.

1550: And it's Ding who takes the chance, clearing up with vim to haul himself back into the mix. 3-2. What a match.

1543: That's more like it - a break of 57 gets Ding's cue-arm moving in smoother style. Higgins then flukes a cheeky red and sinks a troubling pink, only to miss a regulation red to the bottom left. It's wide open.

1539: A well-hidden black forces Ding to go safe. It's a brave man who takes The Higgler on in a duel of safeties at the mo, but the world champ clangs a red into the jaws and Ding dives in.

1534: Here we go - Ding breaks, and a thick contact on a red from Higgins on his first hello to the table gives the Chinese tyro an early opening.

1514: At 69-0 up, and two snookers needed, Ding comes back to the table. It's a hopeless task, and Higgins is 3-1 up in moments. Time for the mid-session interval, and Ding needs to get a glass of wake-me-up juice down his neck sharpish.

1510: Higgins clocks up a super-smooth 46 before a tricky angle on the black forces a safety. Ding goes at a long red with wild-eyed abandon and misses again, and The Higgler is in again. Rash - very rash.

"Impatient again from Ding. He misses another long one and the Pastry Cook is in again ."
The Boss on 606

1505: Ding's all over the place here. He misses a straighforward red to the bottom right by the length of his bow-tie, and Higgins is ready to pounce.

1502: Consider it polished - Higgins clears to the pink with a break of 73 to squeak his nose in front. Ding slumps on his chair, his chin resting on his right hand.

1453: It's Ding who cracks first, taking on a long pot so risky klaxons almost blare out as his cue arm goes back. Higgins lands a cheeky plant into the centre right and the balls are now placed perfectly for him to polish this off.

1449: Cagey cagey at Wembley - safety follows safety, with both men reluctant to gamble on a series of long-rangers.

1444: The break is up to 41, but the attempted screw off the bottom cushion into the pack doesn't free an easy red up. Ding has a pop to the left middle, but the red stays afloat.

1440: Ouch. Higgins misses a tricky red to the left middle and Ding pounces. He doubles a red to the same pocket and he's up and running once again.

1436: There it is - Ding's break of 74 brings him level. Generous applause from the matinee crowd.

1433: Fine work from Ding - with the scores level, he cuts a red from the remaining pack delicately into the bottom left to nose in frornt. He'll surely seal the deal here.

1429: Afternoon snooker loopies - and I bring bad news for fans of Higgins: with a break of 39 on the board, he's just missed a simple red to the bottom right pocket. With the balls well-placed, Ding's got a super chance to draw level here.

By Mark Orlovac

1422: We didn't have to wait long for that. Higgins gets another turn but Ding stays in his seat after the Scotsman sinks a red. 1-0 it is then.

You lot take care now, the lad Fordyce is primed and will keep you company for the rest of the day.

1419: Fine start from Higgins. He fires a 71 with the help of an impressive recovery after getting out of position for a long green. The run puts him 66 ahead with 59 on the table but Ding does not concede and continues playing. He wants to get a feel for the table obviously. You can't blame him.

"Just to clear up a comment from Mark Orlovac's breathtakingly excellent live commentary, Wayne Mardle was fairly conservatively dressed, with a smart blue shirt on. No hint of a Hawaiian shirt, I'm afraid."
BBC Sport's Phil Harlow at Wembley

"At work just outside Wishaw. The Wizard will pull through, winning by two frames. I can feel the vibes already!"
From Alan via text

1412: Oops. First mistake by Higgins. He completely misjudges a safety shot and manages to sink the white. Ding fires in a long red but then spoons a simple brown to the green pocket. Nervy stuff.

1409: Ding and Higgins are being introduced to the crowd by a master of ceremonies who looks remarkably like former England and Lions rugby star Will Greenwood. Or is it just me? Ding gets the match started. Get comfy now, this could be a good one.

"Darts legend Wayne 'Hawaii 501' Mardle has just popped into the media room on a whistlestop tour of the backstage area before taking his seat for the first match."
BBC Sport's Phil Harlow at Wembley

Quality. I wonder if he has one of his spectacular shirts on?

1400: We are almost there people. I've just put my air guitar down after listening to the BBC snooker theme tune. Have to be honest though, I did prefer the old version.

1355: The latest text in the inbox is about a hotel in Egypt that wasn't to the sender's liking. Oh dear. There is another which cannot be repeated to a family audience - I am actually blushing. What I'm actually trying to say is that if want to get some chat going about the snooker, now is your chance.

1346: Before I forget, my esteemed colleague Phil Harlow will be feeding into this commentary all throughout the day from Wembley - if he can actually tear himself away from the bacon rolls. He is also on 606, a place where you can get involved in all sorts of chat. Beautiful scenes.

"I can't call either of these matches today. Yesterday I backed Williams and Robertson and look how well that prediction worked out. Today I'm going for Ding and Lee."
Joey Jo-Jo Junior Shabadoo on 606

1340: Play is now due to start at 1400 GMT, with live television coverage on BBC2, while you can also watch the action live on this website. But only if you promise to keep reading the wonderful Fordyce as well.

1327: Right, first up we have world champion John Higgins, the Wizard of Wishaw to his friends, against last year's finalist Ding Junhui. While we wait for the action to start, get involved on the texts, using 81111, or alternatively on 606. Go on, you know you want to.

1318: Afternoon all and welcome to live commentary of day four of the Masters from Wembley. Sorry to disappoint you but I'm afraid you have got me for a little while as the legend that is Tom Fordyce is running a wee bit late.

"It's my first visit to the Masters, and I'm very much looking forward to experiencing the Wembley magic inside the Arena. Almost as much as I am to experiencing the salmon fishcakes that Saj has been talking up so much."
Phil Harlow takes the reigns for BBC Sport at Wembley

"I think Ding is coming back to near his best form and will take some stopping if he's at his best today. Having said that, Higgins is the world champ so you never write him off!"
kellie-text on 606