Ryan Moore harvested his fifth PGA Tour victory with a bogey-free final round at the John Deere Classic on Sunday.
Moore, who started the day with a one-shot edge, closed the deal with a four-under-par 67 at the soggy TPC Deere Run in Silvis, Illinois.
He finished at 22-under 262, two strokes ahead of fellow American Ben Martin (68).
Moore, 33, collects $864,000 for his victory at the PGA Tour event, which clashed with the debut of Olympic men's golf, where Briton Justin Rose received no prize money but claimed a prized gold medal for his victory in Rio.
Moore triumphed over an underwhelming field in Illinois.
Jordan Spieth, last year's John Deere Classic champion, did not defend his title, deeming it inappropriate after he pulled out of the Olympics due to 'health issues'.
Fellow American Dustin Johnson, who also made himself unavailable for Rio, also skipped the John Deere, which is usually played in July but was moved this year to play opposite the Olympics.
Former US amateur champion Moore extended his overnight lead to five before Martin created a bit of excitement with three consecutive birdies from the 12th to close the margin to a couple of strokes.
However, that was where the gap remained, as both players parred the final four holes.
"On this course you can rattle off a few birdies in a row real fast," said Moore, who played the final 46 holes without a bogey.
"I was trying to make birdies coming down the stretch. I was trying to stretch that margin out a little bit but I couldn't get any putts to go and in the end snuck it out."