Collin Morikawa has become the second golfer in the past month to go straight from college to winning on the PGA Tour.
The 22-year-old Californian birdied his last three holes to win the Barracuda Championship in Reno, Nevada.
A recent University of California graduate, Morikawa made the most of the sport's biggest names being engaged at the World Golf Championship-St Jude Invitational.
He closed with seven birdies against no bogies on Sunday at the Montreux Golf and Country Club and won by three points with a total of 47 from fellow American Troy Merritt under the tournament's modified Stableford scoring system.
He joins Matthew Wolff of Oklahoma State as players who have gone straight from college to securing a future on the PGA Tour by claiming a win.
Wolff won the 3M Open in Minnesota three weeks ago, making an eagle putt on the final hole to beat Morikawa.
"It was something really special to finally get the win," Morikawa said.
His best shot was on the 17th hole when he holed a 30-foot birdie putt with enough pace that it might have gone some six feet by the hole.
"It felt good to make that putt, but obviously I had one more hole to play," Morikawa said. "There was a lot of points on the board left, and I knew I had business to do on 18. And I hit three good shots and was able to tap in for birdie."
RIGHT: Morikawa banked US$630,000 for his maiden victory on the PGA Tour. PHOTO: Marianna Massey/Getty Images.
He has made the cut in all six of his starts since his May 18 graduation, including his tie for 35th in the US Open at Pebble Beach.
After his second in Minnesota, he tied for fourth in the John Deere Classic before winning the Barracuda.
His 14 points translate to a 65, meaning Morikawa has an average final round of 66.83, his worst Sunday score a 69 in the US Open.
While he was already assured of a PGA Tour card for next year with his good results, the victory gives him membership immediately, with his points retroactive.
Morikawa is at No.46 in the FedEx Cup, and he cracked the top 100 in the world ranking.
He earned US$630,000 (AU$910,000), giving him US$1.673 million (AU$2.3 million) since graduating from college just over two months ago.
The victory does not get him into the Masters, however, because the Barracuda Championship was held opposite a World Golf Championships event.
Robert Allenby was the sole Australian to make the cut and finished well off the pace on 12 points, adding just two to his total in the closing round.