Harrington was troubled by injury problems

Nick Faldo disappointed again with a 78 for 11 over and Spain's Jose Maria Olazabal had a sextuple-bogey nine at the 17th to finish on 17 over.

Phil Mickelson and Ernie Els, both tipped to challenge for the title, finished the tournament 16 shots off the lead on six over.

But veteran Tom Watson showed them how it should be done as he shared the honour of carding the best score of the final round with Tiger Woods.

The 52-year-old American made up for the disappointment of hitting an 83 in the third round with a five-under 67 which included seven birdies.

But Watson admitted his heroics had come far too late as he finished the tournament on nine over.

"It's bittersweet. Eighty-three is an ugly score. It sticks in your craw when you shoot an 83," he said.

"I went out today to prove to myself that I could do better than that.

"Granted, the conditions were tough yesterday, but an 83 is still an ugly score and I was very embarrassed by it. I atoned for my sins yesterday to a certain degree."

Pat Perez had the distinction of playing the day's fastest round after going out first on his own.

The American completed the 18 holes in just 111 minutes, finishing his round as the pair behind, who had started 10 minutes after him, were on the 10th green.