The Swede's victory was his first on the U.S. circuit since the 2009 Players Championship but follows a second place finish at the British Open and third spot at the PGA Championships.
"I just played a little bit better in the final round and I'm really pleased with the way I bounced back," Stenson told AFP.
"I got off to a bad start (bogeying the second hole)... but I came back with three straight birdies on four, five and six to put me back into the ball-game. I made some nice putts today and just kept it going. I have been playing nicely for a long time."