Canadian Adam Hadwin survived a late wobble to claim his first PGA Tour title at the Valspar Championship in Florida.
The 29-year-old, who rose to prominence when he shot a round of 59 at the CareerBuilder Challenge in January, appeared to be cruising to victory until he drove into water at the 16th.
That led to a double bogey and saw him caught by playing partner Patrick Cantlay.
However, Hadwin regrouped to par the 17th and 18th, with Cantlay dropping a shot at the last after finding a bunker with his approach to hand Hadwin the win.
Hadwin carded a closing 71 for a 14 under total, one clear of Cantlay, who recorded a 68 after starting the final round at Innisbrook Resort four behind.
Americans Jim Herman and Dominic Bozzelli tired for third on 12 under, with Open champion Henrik Stenson the leading European on eight under - enough for a share of seventh.
Hadwin dropped a shot at the sixth after missing a five footer, but birdied the eighth from 11 feet, picked up another shot at the long 11th and drained a 53-foot putt on 13 before his wayward tee shot on the 16th almost proved costly.
"I don't know what to say right now," Hadwin told pgatour.com.
"I fully expected Patrick to make that putt (on the last).
"I said yesterday I just wanted to have a chance to win coming up the last and I had it - I'm just glad that one footer wasn't one and a half feet."
Graeme McDowell shot one of the rounds of the day as four-under 67 lifted him into a tie for 14th on five under par, while Seamus Power shot 70 to finish on two under and tied for 27th.