A brilliant eagle at the 16th helped Bryson DeChambeau claim his fourth PGA Tour title of the calendar year at the Shriners Hospitals for Children Open in Las Vegas.
DeChambeau trailed defending champion Patrick Cantlay by a single shot with three holes to play but he holed his 58-foot eagle putt from just off the 16th green to jump to 21 under par.
And with Cantlay unable to save par at the 17th, DeChambeau suddenly found himself in possession of a two-shot lead.
The 25-year-old, who began the day in a share of the lead with Peter Uihlein, then safely parred his remaining two holes to win by a single shot after Cantlay had closed his round with a birdie at the 18th to get to 20 under.
Speaking afterwards, DeChambeau said: "I was just coming out here to try and kick the rust off, and was able to play some great golf.
"I didn't putt my best but I was still able to get it done so I'm pretty proud of that."
Fellow American Sam Ryder was alone in third place on 19 under.
Uihlein, who led across the first three days in Nevada, had a miserable round of 75 and dropped into tied for 23rd - a double-bogey on the par-3 14th the low point.
DeChambeau also won the Memorial Tournament, the Northern Trust and the Dell Technologies Championship in 2018
Graeme McDowell finished in tied 41 on nine under.