US unless stated -9 M Weir (Can), V Singh (Fij) -7 J Ogilvie -6 J Rose (GB), T Lehmann, H Mahan, S Cink -5 R Damron -4 M Hensby (Aus), J Parnevik (Swe) Clubhouse scores

Weir had a chance to win in regular play but a birdie miss at the 18th left him tied with Singh on nine-under 275.

The pair then replayed the last but that failed to separate them - with both men making strong birdies.

Both players then bogeyed the 17th before returning to the 18th, where Weir dropped a shot but Singh birdied.

"There was one guy I didn't want to beat this week and that was Mike and I do feel for him," said Singh.

"But I came here really focused and I really wanted to win."

Weir was attempting to become the first home winner of the event since Pat Fletcher in 1954 and went into the final round with a three-stroke lead.

I was disappointed for everybody but maybe in the end I was trying too hard Mike Weir

But a double bogey at the second hole was the start of a roller-coaster fourth round.

Birdies on three of the next four holes were then followed by a bogey at the seventh with birdies at the eighth and 10th.

Then the wheels came off with further bogeys at the 11th, 13th and 16th holes.

That opened the door for Singh's short birdie putt on his 72nd hole after a great chip to force a play-off.

"It was a tremendous week, something I will never forget," said Weir. "I was disappointed for everybody but maybe in the end I was trying too hard."

And the Canadian revealed he had been grabbed by an over-enthusiastic fan on the 11th hole.

"This guy just came out and grabbed me hard on the back of my neck and shoulder," he said.

"It was most unfortunate. I guess he had been drinking too much or something."

England's Justin Rose claimed a share of fourth-place after a sparkling final-round 63 left him on six-under for the tournament.