Graeme McDowell stormed back to beat Tiger Woods in a play-off and win the Chevron World Challenge.
Woods, who had been on top in Thousand Oaks all weekend, began the day with a four shot lead, but suffered his first bad round of the tournament, highlighted by a calamitous double-bogey on the 13th, to sign for a 73.
That gave McDowell his chance as he overcame two bogeys with five birdies, the last on the 18th, to force a play-off.
And he won that with another birdie putt on the 18th, leaving Woods without a title since he won the Australian Masters a year ago.
"You know, they're the kind of putts that you make them and you can't really believe it afterwards" said McDowell. "They were the stuff of dreams. 2010 has been the stuff of dreams. It's been that kind of year."
He added: "It's been an amazing season. I put that up there, you know, to play with him this weekend and to do it against him, it's definitely another highlight of 2010.
"I'm just very proud of myself the way I've applied myself the last six weeks. It would have been pretty easy just to kick back with the great things I've achieved this year. But to finish as strong as I have and to win twice in the last six weeks, I'm very proud of myself."
Paul Casey also went round in 69 to hold on to third place, ahead of Rory McIlroy, who made four straight birdies en route to a round of 68 that gave him a share of fourth place with Hunter Mahan.
Stewart Cink had the best round of the day, making six birdies and one bogey to go round in 67 and move from a share of tenth to a share of sixth along with Ian Poulter.
Luke Donald dropped to eighth as he could only manage a round of 74, his afternoon marred by a double bogey on the par five 16th.
