Nick Watney earned his revenge on the Blue Monster.
Two years after being narrowly pipped by Phil Mickelson, the under-rated Californian emerged from the pack for a well-deserved two-stroke victory at the $US8.5 million Cadillac Championship in Florida.
Watney carded a closing five-under-par 67, finishing in style with a four-metre birdie at the dangerous final hole for his first victory in a World Golf Championships event.
"I think I've settled the score," said Watney after finishing at 16-under 272 on the Doral Resort's Blue Monster course, while fellow American Dustin Johnson, the third round leader, carded 71 for second place on 14-under.
Australian Adam Scott was in contention until he made a complete mess of the par-five 12th, running up a double bogey. Scott battled on to shoot a decent 71 and tie for sixth, five strokes off the pace.
He waited outside the scoring area to greet his good friend Watney with an enthusiastic high-five.
"His results are showing how good he's playing," Scott said of Watney.
"The difference at the moment is that he's making a lot of putts and his chipping has improved. He's feeling pretty confident chipping, where he felt not so confident recently.
"That rubs into all parts of the game. He's a pretty unassuming guy but he's got a lot of game."
Watney, 29, arrived at Doral's Blue Monster ranked 31st in the world, but one of the hottest players in the game, albeit not one of the most publicised.
He had finished in the top 10 in every start this year.
He collects $1.4 million for only his third victory on the US PGA Tour.
Runner-up Johnson blew his chances with a bogey at the 16th hole.
"I played really well," he said.
"I just couldn't get it in the hole with the putter. I hit a lot of great putts (but) they were just not going in."