Justin Thomas, victor at the 2017 US PGA Championship, trumped friend Jordan Spieth to win the Dell Championship in Boston by three strokes, his fifth title in a breakout season.
The 24-year-old carded a final round 66, which was too much for Spieth and Aussie Marc Leishman, who both took turns to lead the tournament on Sunday.
“It was just a really, really patient hard-fought week. It feels good any time you can get it done, but especially in a play-off event,” Thomas said.
Open champion Spieth leads the FedEx Cup standings, but this win leaves Thomas just 27 points adrift.
"I'm in a lot better shape now obviously for the FedEx Cup but I'm excited to have a week off and get some rest," Thomas told Sky Sports.
"These (last) two weeks really felt like a long two weeks, they felt like three or four - a lot of travelling in between. I'm a little tired and excited to sleep in my own bed tonight."
-17 Justin Thomas
-14 Jordan Spieth
-13 Marc Leishman
-12 Jon Rahm, Paul Casey
In the bag
Thomas averaged 307.8 yards off the tee, and had a green in regulation average of 70.83%. On Sunday, his strokes gained putting was 1.740.
Driver: Titleist 917D2 (Mitsubishi Diamana BF60 TX), 8.5 degrees
3-wood: Titleist 917F2, 15 degrees
5-wood: Titleist 915Fd, 18 degrees