Tiger Woods survived a few anxious moments on the back nine to clinch his fourth US PGA Championship and 13th major title with a two-shot victory at Southern Hills.

Three strokes clear overnight, the world number one fired a one-under-par 69 for an eight-under total of 272, finishing ahead of fellow American Woody Austin (67) at a sun-baked Southern Hills Country Club.

South African Ernie Els birdied four of the first 10 holes on his way to a six-birdie 66 and third place at five under.

Woods, who claimed his 59th PGA Tour title, became only the third player to win at least four PGA Championships. Fellow Americans Jack Nicklaus and Walter Hagen won five apiece.

The American's last major victory came in the 2006 PGA Championship at Medinah

Overwhelming favourite at the start of another stifling day, Woods briefly stretched his lead to five when he rolled in a curling 25-footer from the fringe at the par-three eighth.

As the ball dropped into the hole, he pumped his fist in celebration.

However, he then bogeyed the uphill ninth to reach the turn in one-under 34 and also faltered at the par-three 14th, where he three-putted for bogey.

At that point, his lead had been trimmed to one with Austin and Els his closest challengers.

With typical timing, though, Woods hit back with a birdie at the par-four 15th, calmly rolling in a 12-footer to restore his two-stroke cushion. He safely parred the last three holes to ensure he ended another year with at least one major title.

After his ball dropped into the cup, the game's leading player removed his cap and lifted both arms into the air to acknowledge the roars from the crowd packed around the green.

Austin, who booked a place in the U.S. Presidents Cup team with his first top-10 finish in a major, was delighted Woods was given a bit of a fight in the final round.

Three-times major winner Els, meanwhile, rued a few missed putts after posting his fourth top five finish in the PGA Championship.

Canadian Stephen Ames, who played with Woods in the final pairing after lying second overnight, fell back into a tie for 12th at two over after closing with a 76.

Temperatures reached 102 degrees (39 degrees Celsius) in the final round, with a heat index of around 110 making it one of the hottest days in major championship history.

Reuters