Norton, Mass. - Webb Simpson finished off an amazing comeback with three clutch birdies, the final one on the second extra playoff hole Monday in the Deutsche Bank Championship for his second win in three weeks.

On a day filled with big crowds and big moments appropriate to the FedEx Cup playoffs, Simpson delivered a stunning conclusion on the TPC Boston.

He looked as if he would be the runner-up until knocking in a 30-foot birdie putt on the par-5 18th hole for a 6-under 65. That put him into a playoff when Chez Reavie, who had birdied the toughest holes on the back nine, made bogey on the easiest hole on the course at No. 18 for a 66. The finished regulation at 15-under 269.

On the 18th hole in the playoff, Simpson again looked to be out of luck when Reavie chipped to tap-in range for birdie. But Simpson rolled in a 15-foot putt to keep the playoff going, and then won with an 8-foot putt on the 17th hole.

Simpson won his first PGA Tour title three weeks ago at the Wyndham Championship, putting him in good shape for the FedEx Cup playoffs and the chase for a $10 million prize.

Now, he goes to No. 1 in the standings and is assured of being among the top five when the FedEx Cup concludes at the Tour Championship at the end of the month.

"I thought winning the second time would be easier," Simpson said.

That was never the case on a breezy Labor Day south of Boston, a final round so scrambled that seven players - including world No. 1 Luke Donald - had a share of the lead at some point.

Simpson one-putted seven of his last eight greens, mostly for par on the back nine in regulation to stay in the hunt, then received just enough help from Reavie.

The win was filled with perks, beyond his ranking in the FedEx Cup race. Simpson locked up a spot on the Presidents Cup team in Australia, and moves to No. 14 in the world.