Los Angeles - Joaquin Niemann fired a closing round of 64 on Sunday to capture The Greenbrier by six strokes and become the first Chilean to win on the US PGA Tour.
The 20-year-old Niemann roared home with three straight birdies on his final three holes, capping it off with a 25-foot bomb on 18 at the Old White TPC course in Sulphur Springs, West Virginia.
He is the youngest non-American winner on the Tour since 1923 and the first third round leader to hold on and claim this event.
Niemann was overcome with emotion while being interviewed by a television reporter as he walked off the green at 18 and realized the magnitude of his victory.
"I have been thinking about this my whole life. I don't even think I realize what happen today.
"It's crazy. I am really happy for all the support, my family, my coach .... It's just crazy, sorry," he said through tears of joy before walking off camera.
Niemann finished with a 21-under par total of 259, six shots ahead of American Tom Hoge, who shot a 65.
Brian Harman, Harris English, Nate Lashley and Richy Werenski finished in a tie for third at 14-under.
The tournament moved from its traditional spot in July to September to kick off the fall schedule for the 2019-20 PGA season.
Niemann started quickly on his back nine, rolling in three birdies on his first four holes, including a challenging sidewinder putt on the par-five 13th.
He also posted birdies 16 and 17 before saving his best for last as he made a 25 footer on the final hole to boost his lead to six strokes.
"My game was feeling great and mentally I was awesome. I was just feeling like I was going to win this tournament from the first day," he said.
The win also earned him spots in the 2020 Masters and the PGA Championship.
Niemann recorded his first win in his 44th start on the PGA Tour.
It is a remarkable victory for the rising star. He won at a younger age on US soil than Seve Ballesteros, Sergio Garcia or Rory McIlroy.
"It has been unbelievable for my whole country they were watching me. I got a couple of texts from them," he said. "So I am really happy to get the trophy for my family, for my coach, and everyone back there in Chile. It doesn't get any better."
Niemann had a stellar amateur career, winning the 2018 Latin America Amateur Championships, and was the top ranked amateur from May 2017 to April 2018.
He has nine career top-10 PGA finishes, including two ties for fifth last season.
Defending champion Kevin Na shot back-to-back 68s on Saturday and Sunday and finished in a tie for 14th.
Kevin Chappell, whose second-round 59 on Friday was just the 11th sub-60 round ever produced on the PGA Tour, stumbled to the finish with final rounds of 73 and 72.
The Tour heads to Jackson, Mississippi, next week for the Sanderson Farms Championship. Niemann is in the field along with Zach Johnson, Jimmy Walker and Brandt Snedeker.
Leading final-round scores on Sunday in the US PGA Tour's The Greenbrier at White Sulphur Springs, West Virginia (USA unless noted, par-70):
259 - Joaquin Niemann (CHI) 65-62-68-64
265 - Tom Hoge 68-65-67-65
266 - Harris English 66-65-68-67, Brian Harman 65-66-70-65, Richy Werenski 67-65-65-69, Nate Lashley 68-64-65-69
267 - Juan Sebastian Munoz (COL) 69-66-66-66, Robby Shelton 62-65-70-70, Scottie Scheffler 65-62-71-69
268 - Matt Jones (AUS) 68-66-68-66, Viktor Hovland (NOR) 68-68-68-64, Mark Hubbard 64-70-67-67
269 - Lanto Griffin 64-68-70-67
270 - Austin Cook 66-68-68-68, Bud Cauley 69-67-67-67, Adam Long 66-62-70-72, Joseph Bramlett 67-67-65-71, Kevin Na 64-70-68-68
271 - Im Sung-jae (KOR) 66-67-67-71, Harold Varner 65-66-72-68, Scott Piercy 69-65-69-68, Harry Higgs 67-66-69-69, Bronson Burgoon 65-68-69-69