Tiger Woods knocked in back-to-back eagles to capture his third consecutive PGA Grand Slam title at Poipu Beach, Hawaii - but he credited a less spectacular shot for the win. The shot that did it for Woods was his five-foot putt on the 199-yard 17th hole.

He insists that gave him the momentum to fight back against Vijay Singh - even though an eagle on the final regulation hole and then on the play-off hole sealed his victory in such memorable fashion.

"That putt is what gave me a chance to really have an opportunity to tie it or if not win it outright," said the world number one. "If I had missed that putt, two down and one to go. I knew if I could somehow grind it out and make it I would at least have some kind of momentum going into 18 - and I was able to do that."

Singh birdied the 550-yard closing hole to open a two-stroke lead to take a seemingly unbeatable advantage. But Woods, as usual, came through. He countered with his eagle, setting it up with a seven-iron approach from 231 yards out. On the first extra hole - again the 18th - he placed his approach in almost the same spot on the green and calmly dropped in his second eagle putt to win the first prize of $400,000.

"Same putt, same line," he said of the winning stroke. "I've had back-to-back eagles before, but never in a tournament like that; not with everything on the line. It was nice to be able to execute the shots the way I wanted to."

It was Woods' 11th victory this year, including nine on the US PGA Tour - three in the majors.