Tiger Woods had his problems but a round of 71 ensured that he will take a two shot lead into the final round
Jose Maria Olazabal eagled the 12th and birdied the last to claim second place on his own at 10 under.
Britain's Colin Montgomerie recovered from a dropped shot at the 17th and his birdie putt just had the legs to drop at the last to leave him on nine under.
Retief Goosen finished with his eighth birdie of the day and a round of 66 took him up to minus nine also.
UPDATES FROM THE COURSE (All times BST)
1922: Monty's 12-foot putt drops with its last breath and the birdie takes him into a share of third at nine under.
1920: Woods again has the benefit of learning from Monty's putt, but his putt is still skilfully judged, leaving him a tap in of a foot for a birdie, a round of 71 and a total of 12 under.
1918: After a huge ovation from the crowd, Monty leaves his long putt well short.
1913: Monty's ball is close to knocking into Tiger's but it stops short of the rough at the back of the green.
1912: A booming drive up the last winds it way pin high and into excellent position for Woods to extend his lead.
1910: Woods punches the air in animated fashion after holing his putt for par that retains a one shot lead.
1909: Singh finishes with a birdie to reach seven under.
1908: His par attempt is six inches wide on the left and he drops to eight under.
1906: Monty splashes out of the sand expertly, but despite the impressive escape, it is still 12 feet past the flag.
1905: Tiger's unenviable, steeply undulating putt races up seven feet past.
1902: From the perfect place in the fairway, Monty's nine-iron comes up short and trickles into an awful spot in thr Road Hole bunker.
1901: Woods is short of the green and the contours of the fairway take the ball away to the left.
1900: Singh cuts in a fabulous shot into the final green and the ball bounds past the flag to around 20 feet.
1857: Woods finds the rough to the left at the fearsome 17th.
1855: Monty also holes out to secure his par.
1854: Tiger, having putted up short, calmly holes out from three feet to drop one shot.
1852: Monty's difficult putt is a couple of feet short.
1850: Woods attempts a flop shot from the fluffy lie but it races past the flag and into an undulating spot through the green.
1849: Olazabal holes out from nine feet for a closing birdie that gives him a round of 68 and a 10 under total.
1846: Tiger's approach runs through the green into one of the few grassy, lush lies remaining on the course.
1844: Montgomerie finds the putting surface.
1841: Woods positions an iron wide of the group of fairway bunkers, and Montgomerie hits an excellent tee shot down the centre.
1839: Monty rattles in his par putt and stays nine under, to the delight of the sun-baked crowd, many of whom have over-imbibed.
1838: Tiger's putt is nine inches short and he taps in for a par.
1837: The young Spaniard holes out safely and is round in 69 for an eight under total after three rounds.
1836: Garcia has an eagle chance at the last from pin high but leaves the putt four feet short.
1835: Olazabal holes a nervy one from three feet to par the last and remain at nine under.
1834: Woods trickles though the green with his approach at the 15th, while Montgomerie comes up short after an unusually soft bounce.
1827: Woods misses his birdie chance too and the gap stays three.
1826: The putt was always left and he stays at nine under.
1824: Monty's steep putt from off the green is well judged for pace but the line is slightly awry and he will face an eight foot putt for his birdie.
1819: Woods goes through the back of the 14th green.
1817: Olazabal's birdie putt slips past on the left and he stays at nine under, tied with Monty and Goosen.
1816: Singh's birdie putt wriggles in at the 14th, continuing his mixed round, and he is seven under again.
1811: Garcia three putts the 16th to drop to six under.
1810: After Woods elects to putt first even though he is further away, Monty squeezes his in too and two pars are recorded.
1808: But both leave putts well short after finding the edge of the green at the par-four 13th.
1758: Both players in the final group spank superb drives into the small driving area clear of the many varied hazards.
1755: Daly finishes with a birdie to card a round of 70 for six under.
1754: Woods moves three ahead by confidently holing his birdie chance.
1753: Monty is up straight away as he leaves the putt a foot short.
1751: Woods leaves a putt eight feet short.
1750: Olazabal's birdie attempt on the 14th stays on the edge of the hole and he taps in for a par to stay nine under.
1748: An amazing escape from Montgomerie slips up to the flag and finishes eight feet beyond.
1745: Clark takes three from the back of the final green and finishes with a par for a six under total.
1743: Woods launches another mighty drive that avoids all the trouble and finds the front edge, while Monty's ball drifts left into the rough.
1739: Groans signal a first bogey for Montgomerie, his putt for par staying on the left edge.
1737: Monty's putt finishes eight feet short and Woods has the advantage of watching it first, lagging his up stone dead to make a par.
1735: Olazabal holes out from two feet for a bogey at the 13th to slip back to nine under.
1733: Both players in the final group finish in virtually the same spot in a swale 25 feet from the pin on the 11th green.
1728: Woods gives it a chance but it misses on the left, while Monty calmly sinks his birdie putt to move within one of the lead.
1727: Monty hits an imperious approach to four feet at the 10th, with Woods following him pin high but 15 feet left.
1721: The unpredictable Olazabal finds a deep fairway bunker with his drive at the 13th.
1717: Olazabal watches a putt from just off the green inch into the hole for an eagle at the 12th and the Spaniard claims a share of second on his own at 10 under.
1716: Woods holes out to stay at 11 under.
1715: It looked as though it was short but it topples in and the huge cheers signal that Montgomerie has reached nine under.
1714: Monty's effort slides by on the right and drifts five feet past.
1712: Having taken a drop out of the prickly stuff, Woods putts up onto the green and the hole and the ball has a look before slipping by the right edge and two feet beyond.
1707: Montgomerie, by contrast, drives the green to the delight of the increasingly vocal galleries.
1706: Woods uses a fairway wood off the tee at the ninth but it drifts left into more gorse bushes.
1704: Immelman birdies the ninth to return to seven under.
1701: A strangely subdued Els taps in for a round of 75 but is out of contention at level-par for the Championship.
1659: Woods has no problem holing out and he stays at 11 under.
1657: A superb approach putt from Monty up the hill threatens the cup but ends a few inches wide, giving him a cast iron par.
1656: Woods plays a delicate chip and run up the bank and the ball finishes three feet from the hole.
1654: Garcia three-putts the 11th to slip back to seven under.
1653: Montgomerie looks to have struck his perfectly but it trickles through the green.
1652: A bizarre misjudgement from Woods at the par-three eighth, his ball bounding 50 yards beyond the flag.
1651: Singh drops back to six under with a bogey at the eighth.
1645: Woods paces his effort to perfection and restores his two-shot advantage with a birdie three at the seventh.
1644: Monty's birdie putt fails to turn in from the left as he thought it would but he remains eight under.
1639: A dramatic Woods pitch lands two feet from the flag but jumps back and spins 15 feet away, followed by Monty who plays his approach to a similar distance.
1637: Singh judges one perfectly from eight feet at the seventh for his third successive birdie, reaching seven under.
1633: Mickelson misses another chance for a birdie, a five-footer slipping by on the 16th and he stays back at four under.
1631: Clark misses from 15 feet for a par and drops to seven under.
1630: Monty leaves another birdie chance a few inches short and he remains at eight under.
1629: Woods sees his effort break to the right at the last moment and he takes a bogey five to drop to 10 under again.
1627: Garcia holes a massive putt for an eagle after driving the green at the ninth and he gets himself to eight under.
1625: Woods pitches to around 12 feet of the flag, the ball stopping dead when a few more turns would have worked better for him.
1623: While Woods takes a penalty drop out of the gorse, Montgomerie finds the heart of the sixth green in regulation.
1619: Daly holes from five feet and reaches seven under.
1618: Woods leaks a drive out to the right and it squirms through the crowds into the gorse bushes.
1615: Montgomerie knocks in his birdie chance from eight feet and reaches eight under, three behind.
1613: Woods leaves his eagle chance a foot short but the birdie at the fifth gives him a two-shot cushion again at 11 under.
1612: Clark taps in for a birdie at the 12th to get back to eight under.
1611: Monty putts up to six feet from well below the level of the flag in front of the green.
1607: Immelman birdies the fifth and joins the seven under group.
1604: Goosen taps in from a yard for a closing birdie and he gets back to within one shot of Woods.
1603: Crowd favourite Sandy Lyle delights the galleries with a 12-foot effort for a birdie at the last for a round of 69 that leaves him six under.
1602: The 20-footer drifts away to the right, three feet from the cup.
1558: Goosen flicks a three-wood onto the final green and will have a putt to tie for the lead.
1556: Having raced his first putt six feet past, Montgomerie knocks in the return confidently for a par to stay seven under.
1555: US Open champion Michael Campbell finishes with a birdie at the last and joins the big group in third spot at seven under.
1554: Woods chooses the putter from off the green and rolls it up expertly to within a foot for a safe par.
1551: Goosen misses on the left edge from three feet as the 17th claims another shot, the South African now two behind Woods.
1550: Montgomerie finds the wrong side of the fourth green but Woods, although closer, misses on the left-side and faces an awkward third from the light rough.
1548: Highly-rated Australian Scott finishes with a birdie for a round of 70 that leaves him at five under.
1546: Jose Maria Olazabal drains a mammoth putt on the huge fifth green and the birdie takes him to seven under, the eighth player currently on that figure.
1541: Monty leaves his 10-foot chance a foot short and stays at seven under.
1540: Woods putts up to the holeside and taps in for a par.
1539: A neat pitch to six feet sets up a birdie for Garcia.
1538: Goosen squeezes one in from five feet at the 16th and gets to nine under, only one off the lead.
1537: Woods finds the centre of the green with his second shot at the third, playing partner Montgomerie already on the cut surface, while
1535: Mickelson's third from a blind spot at the 12th finds more trouble in the rough.
1533: Singh misses another one for par at the third.
1529: Woods misses a tricky one from five feet to take three from the edge at the second and drop to 10 under.
1529: Goosen taps in from three feet to birdie the 15th and claim second place on his own at eight under.
1528: Clark slips to seven under, needing to hole from five feet to drop just one at the ninth.
1527: Montgomerie lags a sensible putt up to a few inches from the hole and taps in for his second par.
1525: Daly sees another birdie putt slip by the edge at the eighth.
1524: He knocks one in from 20 feet at the short next and he is now at seven under.
1520: Stuart Appleby's five footer wriggles in the side door and he reaches minus six.
1519: Mickelson's birdie putt stays a fraction short and he remains at seven under.
1514: Tiger's putt for a birdie from around 15 feet is six inches short and he also begins with a par-four, the players given a raucous cheer as they make their way through to the second tee.
1513: Monty's long opening putt finishes right on the lip, leaving him the shortest possible putt for an opening par.
1510: Mickelson rolls one in from 10 feet for his fourth birdie of the day and he gets to seven under.
1508: Vijay Singh misses from five feet to bogey the first.
1506: Tiger Woods, pristine in white roll neck and matching cap, is also given a generous recption and he follows suit with an iron safely down the sun-drenched fairway.
1505: A huge roar for Montgomerie, who avoids the burn by taking an iron off the tee.
1501: South African Clark sees his ball trickle into a fairway bunker at the seventh.
1457: Clarke's bizarre day is completed by a three putt at the last which gives him a closing par and a round of 67 for six under.
1456: Faldo finishes with a three foot birdie putt at the last for a round of 70 that leaves him three under.
1452: Daly misses a short birdie chance at the fifth and remains at seven under.
1450: Garcia recovers his lost shot at the first with a fine birdie at the second.
1447: Darren Clarke drives pin-high at the par-four 18th but leaves himself a monster putt across the whole of the green.
1440: Tim Clark moves into second place on his own at eight under with a birdie at the fifth.
1438: A tap-in birdie at the 12th takes Sandy Lyle to five under.
1436: Garcia's playing partner Scott Verplank birdies the first to join the second group at seven under.
1434: Sergio Garcia opens with a nervy three-putt bogey at the first and immediately slips back to four under.
1431: Daly's first par, at the 4th, sees him remain at seven under in a tie for second place.
1429: Clarke climbs to six under with a successful four-foot birdie putt at the 16th.
1427: Another par, this time at the 11th, keeps Goosen in the group at six under.
1423: An unhappy six at the par five 13th sees Kenny Perry slip back to five under.
1420: Following five pars, Phil Mickelson holes his first birdie at the sixth, following five pars, to move to four under.
1418: Retief Goosen pars the 10th hole, narrowly missing a birdie putt, to remain in the group at six under.
1411: John Daly birdies the third hole - his third birdie in succession - to move to seven under.
1407: Retief Goosen records his third successive birdie and reaches six under.
1406: Tim Clark birdies the first three holes and is tied for second at seven under.
1405: Lafeber pushes one from six feet to bogey the 16th and drop to six under.
1400: Daly holes an epic putt from across the undulations at the second and picks up a second birdie.
1359: Luke Donald atones for three dropped shots by chipping in for an eagle at the ninth and he gets back to three under.
1357: Adam Scott sinks one from 15 feet to turn in two under and get to five under for the Championship.
1349: Big John Daly taps in from two feet for a welcoming opening birdie and he reaches five under.
1343: Clarke's sixth birdie of the day puts him five under.
1338: Maarten Lafeber holes out from five feet to birdie the 14th and join Colin Montgomerie in a tie for second at seven under.
1333: Webster, at five under, drives over the wall and out of bounds at the 13th.
1331: Portly Kenny Perry picks up his fourth birdie of the day at the 11th to reach six under.
1328: Clarke, having also bogeyed the 11th, gets back to four under with a four foot putt at the 12th.
1319: Pony-tailed veteran Miguel Angel Jimenez rolls one in from 15 feet to birdie the third and reach five under.
1310: Ernie Els misses from three feet for a par at the opening hole and slips back to two under.
1309: Saltman taps in from two feet for a round of 68 and a four under total for three rounds.
1308: Clarke pushes his par putt from six feet at the short par-four 10th and drops back to four under.
1302: Steve Webster's long birdie putt at the 11th just drops and his third successive birdie puts him five under.
1258: Clarke's run is in danger after finding a perilous fairway trap.
1257: Hansen holes from the edge of the green at the last for an eagle and posts the clubhouse lead at six under.
1256: Clarke holes out for a par to turn in 32 stokes.
1255: Faldo keeps his round together with a par putt from seven feet at the ninth, where he had driven into a tough spot in a bunker.
1253: Having taken a drop from the gorse bushes, Clarke plays a miraculous lofted pitch to two feet.
1245: Clarke's impressive run continues with an eight foot birdie at the eighth that gets him up to minus five and in excellent position.
1242: Saltman birdies the 16th to reach four under.
1237: Clarke rolls in another at the seventh and is four under.
1225: Clarke's second successive birdie takes him three under.
1212: Faldo birdies the fourth after a neat chip and moves to three under.
1205: Herron, who bogeyed the 17th, gets one back at the last and finishes on three under.
1201: Saltman holes another one, this time from 10 feet and reaches four under.
1144: Big Tim Herron's charge takes a dive with a double bogey.
1143: Scottish amateur Lloyd Saltman holes from six feet to birdie the 11th and reach three under.
1141: Nick Faldo rattles one in from the edge of the third green for a birdie that takes him to two under for the event.
1135: Ian Poulter sports a sky blue shirt with matching embroidery on his white trousers and launches one away at the first.
1125: Drummond moves to five under for the day, four under for the Championship, with a six foot putt at the long 14th.
1123: As Darren Clarke's ball trickles into a bunker at the second to curb his birdie start, Norman misses his chance on the left edge.
1121: Greg Norman, after two pars, sets up a birdie chance with a fine pitch to three feet at the third.
1058: A double bogey at the 12th disrupts Watson's round.
1024: Watson's third birdie of the day makes up for a dropped shot at the seventh and takes him one under for the Championship.
0940: Scott Drummond is making the most of the superb conditions to fire three birdies in his first five holes and move to two under, while Tom Watson reaches two under.
0855: Tom Watson, having just survived the cut and the emotion of Jack Nicklaus' farewell on Friday, starts his round with a par at the first to stay one over.
0815: David Smail of New Zealand and Patrik Sjoland of Sweden get the third round under way.