Gary Woodland won the Reno-Tahoe Open by nine points at Montreux Golf and Country Club.
The 29-year-old went into the final round with a seven-point advantage and a final-round 69 earned him seven points for an overall score of 44.
That earned him victory in the $3million tournament - the only one on the PGA Tour to use a Modified Stableford format which allocates points based on the number of strokes taken at each hole.
Eight points are awarded for an albatross, five for an eagle, two for a birdie, zero for a par, minus one for a bogey and minus three for a double bogey or worse.
Woodland started slowly with a single birdie and 12 pars over his first 13 holes - but three birdies in the final five holes made sure he won with plenty to spare.
He made three sand saves on the front nine before crucially holing out from off the green at the 14th after finding trouble off the tee.
"It felt like it was meant to be this week," said Woodland. "I tried to stay calm and really focus on what I was doing."
The round of the day came from fellow American Jonathan Byrd, who produced 18 points from a round containing an eagle, seven birdies and just one bogey.
It earned him a share of second place with Argentina's Andres Romero, whose closing round yielded five birdies and two eagles.
"My whole mindset was just to be a little more aggressive and give ourselves chances and just free it up," Byrd said.
"And I was able to do that today getting off to a hot start. (I) just felt like I was off to the races."
Brendan Steele had been second overnight but bogeyed two of his last three holes to slip back to fourth on 33 points.
Victory for Woodland, his second on the PGA Tour where he was rookie of the year in 2011, gets him into the US PGA Championship next week.