Tiger Woods appears to be closing in on his 13th major title after taking a three-stroke lead into the final round of the US PGA Championship. Although not as sharp as he was during his second round when he fired a 63, Woods managed three pars to start the round before a birdie at the par-four fourth. Another string of pars was followed by a birdie at the par-four 12th, where he dropped in a 10-footer. A bogey at the par-three 14th dropped Woods to seven-under-par, before four pars to finish his round saw the World No.1 sign for a one-under round of 69. Stephen Ames will be paired with Woods in the final round after the Trinidad and Tobago golfer fired a round of 69 to finish at four-under, one clear of American Woody Austin. In outright fourth place at two-under is John Senden, the Australian shooting a round of 69 which included three birdies and two bogeys. South African Ernie Els (69) is a shot further adrift at one-under, while Australians Adam Scott (70) and Nathan Green (67) are among a group of seven players tied for sixth place at even par. Boo Weekley is also at level par after the American came to the 18th hole needing a birdie for a 63 but he left himself a long attempt and three-putted for a bogey and a five-under 65. Australian Geoff Ogilvy was well in contention after his opening nine holes, but a bogey at the 13th and a double bogey at the last dropped him back to one-over and a tie for 13th place. Fellow Australian Stuart Appleby carded a third round of 72 to finish at three-over, Richard Green fired a 70 to be tied for 38th at five-over, while compatriots Nick O&aposHern (72) and Rod Pampling (72) are a further stroke behind in equal 44th place. Third Round of the PGA Championship, Oklahoma: -7: Tiger Woods 71 63 69 -4: Stephen Ames 68 69 69 -3: Woody Austin 68 70 69 -2: John Senden (Australia) 69 70 69 -1: Ernie Els 72 68 69 E: Adam Scott (Australia) 72 68 70, Arron Oberholser 68 72 70, K.J. Choi 71 71 68, Kevin Sutherland 73 69 68, Nathan Green (Australia) 75 68 67, Boo Weekley 76 69 65, Scott Verplank 70 66 74 +1: Trevor Immelman 75 70 66, Geoff Ogilvy (Australia) 69 68 74 +2: Sean O&aposHair 70 72 70, Peter Hanson 72 71 69 also: +3: Stuart Appleby (Australia) 73 68 72 +5; Richard Green (Australia) 72 73 70 +6: Nick O&aposHern (Australia) 72 72 72, Rod Pampling (Australia) 70 74 72