Tiger Woods launches a trademark charge at Medinah

The pair lead on 14 under with Canada's Mike Weir on 12 under after a 65.

Geoff Ogilvy (68) ends on 11 under, Sergio Garcia (67) and Shaun Micheel (67) are 10 under with KJ Choi (67) -9.

Chris DiMarco (67), Phil Mickelson (68) and Ian Poulter (68) finish among those eight under but the horse may have already bolted up front.

2356: Co-overnight leaders Billy Andrade and Henrik Stenson, playing in the last group, card 78 and 73 for and two under and seven under respectively.

2346: Luke Donald pars the 18th for 66 to book his slot alongside Tiger Woods in the final pairing on Sunday.

Donald had six birdies, with his last bogey coming at his last hole in Thursday's first round.

2332: Luke Donald nails his short birdie putt on 17 to rejoin Tiger Woods in the lead on 14 under.

2325: Tiger Woods hits 17 greens in regulation and amasses eight birdies in his 65 for 14 under. Behind him, Luke Donald fires to within four feet on the short 17th.

2315: Tiger Woods hits a seven-iron to eight feet at the 198-yard par-three 17th and drains the putt to regain the lead at 14 under.

Meanwhile, Shaun Micheel comes home in 37 after taking just 30 for the front nine to end 10 under.

2308: Luke Donald rattles another birdie chance just past the hole to stay 13 under after 15.

2305: Tiger Woods spoils his run of three straight birdies with a missed short one on 16 to rejoin Luke Donald on 13 under.

2256: Sergio Garcia squanders a chance to get to 11 under as his six-footer on 18 misses by a sliver. Shaun Mickeel also misses a good birdie chance on 17 to stay 10 under.

2249: Tiger Woods slots his third straight birdie at 15 to leapfrog Luke Donald and lead for the first time at 14 under.

2239: Luke Donald's birdie putt rolls around the rim but stays out on the short 13th.

2237: Tiger Woods goes for the green with his second on the long 14th and catches the greenside bunker. But he produces a fantastic up-and-down for birdie to join Luke Donald in the lead.

2233: Sergio Garcia bounces straight back to 10 under with a pinpoint approach to 16 to set up a tap-in for birdie.

2230: Sergio Garcia bogeys the 15th to slip to nine under.

2224: Mike Weir drops a shot via the thick right rough on the 18th but still cards a stunning 65 which includes nine birdies and two bogeys.

2222: Tiger Woods stings a three-iron into six feet at the short 13th and sinks the putt to edge to 12 under.

2211: Mike Weir's 20 footer for birdie on the short 17th is bang on line for more than 19-and-three-quarter feet of its journey before trickling just left within the last couple of revolutions.

2206: Sergio Garcia drains a long one at the par-five 14th to reach 10 under.

2153: Phil Mickelson drops a shot on 18 after fluffing one of his trademark flop shots from the upslope behind the green. He cards 68 for eight under.

2146: Mike Weir finds the left fairway bunker on 15 but conjures a sensational shot out of the sand, over the trees short of the green and over the greenside bunker to within three feet. He slots it home for the birdie and ties the lead.

2142: Ian Poulter picks up a valuable shot on the 15th to avoid getting left behind as the birdie express thunders on relentlessly up front.

2140: Mike Weir bags an eighth birdie at 14 to reach 12 under. Phil Mickelson shaves his birdie attempt on the short 17th.

2133: Sergio Garcia birdies the 11th and Phil Mickelson birdies 16, both for nine under. But Luke Donald chips in on nine to turn in 31 and reach 13 under.

2126: Lee Westwood is not involved in the fireworks at the front but cards a solid 71 for four under to keep his Ryder Cup hopes alive.

2115: Tiger Woods birdies the 9th to get to 10 under.

2101: Luke Donald continues his relentless charge with another birdie at the 6th. Tiger Woods birdies seven to join Micheel on 10 under.

2053: Shaun Micheel picks up his fifth birdie of the day at the 8th to reach 10 under on his own.

2047: Luke Donald makes an easy birdie at the long 5th to reach 11 under.

2044: Ian Poulter's approach to the 11th sets up a birdie to take him to eight under.

2027: Tiger Woods joins Shaun Micheel on nine under, one behind Luke Donald, with a regulation birdie (for him) at the par-five 5th.

2020: It gets even better from a British (and Northwestern University) perspective at the 3rd - Luke Donald holes another big birdie putt to go to 10 under and a two-shot lead. But moments later that lead is cut to one again when Shaun Micheel, the 2003 USPGA champion, birdies the 6th.

2010: Luke Donald's putter looks hot as he holes a 15-footer on the 2nd to reach nine under and lead on his own.

1958: Luke Donald holes a 10-footer for par on the 1st as Ian Poulter birdies the 7th to reach seven under.

1954: Davis Love holes his bunker shot on the 2nd to reach eight under.

1947: Tiger Woods birdies the short 2nd to join the leaders on eight under.

1936: Tiger Woods is in the rough twice down the 1st, eventually finds the green with his third and sinks a 25-foot putt for par.

1934: David Toms birdies the second to join the swelling ranks on eight under.

1932: Tiger Woods finds the right rough with his drive on the 1st and hits a tree to land in the rough again with his second.

1930: England's Ian Poulter climbs to join the log-jam at six under after five.

1925: Tiger Woods tees off with college friend Chris Riley.

Meanwhile, Phil Mickelson shaves the hole with his eagle putt on seven but birdies to join the leaders on eight under.

Mike Weir drops a shot at the 4th to slip to six under, while Sergio Garcia edges to seven under.

1910: Two-time US Open champion Retief Goosen cards a 68 for five under. Meanwhile, Phil Mickelson picks up his third shot at the 5th to join the movers on seven under.

1905: Former Masters champion Mike Weir birdies his first two for seven under, with Adam Scott (after three) and Steve Stricker (after one) joining the bunch on six under.

1900: Northern Ireland's Graeme McDowell cards a level-par 72 for one under.

1852: Former Masters champion Mike Weir creeps to six under with a birdie at the 1st.

1840: Phil Mickelson slots a second straight birdie on the 3rd to get to six under, two off the pace. Meanwhile, Jim Furyk leads the swelling group on five under after eight.

And probable European Ryder Cup debutant Robert Karlsson ends on three under after a 69.

1836: American Ryan Moore, the 2004 US Amateur champion, sets a more plausible clubhouse lead at six under after a 67.

1833: Chris DiMarco blazes his fourth birdie in five holes to reach seven under, just one off the lead.

1825: American Ryan Moore, the 2004 US Amateur champion, nudges his way to six under after 17.

1821: England's Justin Rose continues his quiet quest with a third birdie of the day at the 8th to reach four under.

1817: Chris DiMarco picks up a third shot in his first four holes to reach six under, two off the lead.

1815: South Africa's Trevor Immelman sets another nominal clubhouse lead at two under after a third-round 70.

1812: Ernie Els edges to three under after two, while Phil Mickelson pars the 1st to stay four under.

1811: The on-course party at five under is swelled by Jim Furyk (after five) and KJ Choi (after one).

1805: Former Open champion Ben Curtis sets a nominal clubhouse lead at one over after carding a third-round 73.

1758: Chris DiMarco and Harrison Frazar pick up two early birdies apiece to reach five under, just three off the lead.

1750: Lee Westwood sets off with two straight pars to remain three under.

1743: American pair Chris DiMarco and Corey Pavin join the throng milling about on four under. Pavin, assistant Ryder Cup captain, birdies the 9th, while DiMarco, runner-up in three recent majors, picks up a shot at the 1st.

In-form American Jim Furyk also joins the group as Retief Goosen drops back with a bogey at 12.

1735: Justin Rose, almost the forgotten man of European golf, edges quietly to three under with a second birdie in his first five holes.

1733: Anders Hansen bogeys the long 10th to drop back to join the group of Goosen and Moore coming the other way.

1725: England's David Howell makes a good start with a birdie at the 1st to edge to three under. He joins a group which includes probable European Ryder Cup debutant Robert Karlsson, who birdies the 12th for three under for the day.

1718: Anders Hansen strikes out on his own and edges to five under after the 9th. The next best-placed man on course is American Ryan Moore at four under through 11 but Retief Goosen and Robert Allenby drop back to three under.

1714: Albatross man Joey Sindelar stumbles with a bogey four at the short 13th to slip to two under, leaving Jason Gore and Corey Pavin, of those already out on the course, at three under.

1704: Australian Robert Allenby joins the party of movers and shakers at four under with two birdies in his first four holes.

1658: The 48-year-old Joey Sindelar follows up his astonishing albatross with a bogey, three straight birdies and then three pars in a row for three under to reach the 13th three under for the tournament.

1648: South Africa's Retief Goosen begins to stir and edges to join Moore and Hansen on four under with a third birdie of the day on the 8th.

1640: American Ryan Moore and Dane Anders Hansen are the day's big movers so far, both reaching four under after nine, three under for the round.

1621: Jeff Maggert holes his second shot at the opening hole for an eagle to move up to three under.

1614: After his impressive outward nine, Baddeley can only par the par-five 10th, the third successive time he has done so this week, and he stays at three under.

1557: Baddeley's third birdie of the day takes him to three under for the day and the tournament at the turn, while Goosen picks up his second shot of round three to join him at minus three.

1545: The momentum is with Moore and a birdie four at the 5th puts him just four off the lead.

1542: Denmark's Anders Hansen claims two birdies in his opening two holes to move to three under.

1536: Retief Goosen has the perfect start to his third round with a birdie at the 1st. The South African follows it up with two pars and is on two under together with Miguel Angel Jimenez - who also claims a stroke at the 1st.

1533: Moore is soon joined by Baddeley, who claims his third birdie of the day so far at the par-five 7th. Baddeley has claimed a shot at this hole on all three days.

1532: American Ryan Moore makes an early charge and after a birdie at the 1st, he claims another at the 4th to move to three under.

1528: Northern Ireland's Graeme McDowell, who carded a second-round 68 to make the cut, bogeys the 3rd to slip to even par.

1522: Sindelar gets his round back on track with a stunning albatross at the 537-yard 5th to move to one under.

1517: Curtis slips back to one under after a bogey at the 6th.

1508: Baddeley joins the massive group of players on two under with a birdie at the par-five 5th, his second birdie of the day.

1457: There are plenty of birdies being carded early on. American Dean Wilson gets in on the act with two in his opening two holes.

1440: American Joey Sindelar has a dreadful start with two bogeys in his first two holes to slip to two over.

1423: What a start for Curtis - he claims another birdie at the 2nd and is now six strokes behind the leading quartet.

1415: The first hole of the day is completed, with 2003 Open champion Ben Curtis taking the opening birdie of the day to move to one under. Playing partner Aaron Baddeley has to be content with a par.