Justin Rose let a three-shot overnight lead slip as he lost to David Lingmerth on the third extra hole of a play-off at the Memorial.
The former US Open champion started the final round as the overwhelming favourite having blitzed the Muirfield course on Saturday, shooting a 66 to give him a sizeable advantage.
However, the Englishman stumbled out of the blocks, bogeying four of the opening eight holes before recusing the situation on the back nine to card a level-par 72.
Sweden’s Lingmerth joined Rose at the top of the leaderboard on 15-under after the final round having shot a three-under 69 and then edged out his fellow European with a par at the third extra hole to clinch his first PGA Tour title.
“It’s an honor being here, and winning is surreal,” Lingmerth said.
“I’ve been in a few playoffs. You win some, you lose some. But I didn’t feel that it was my turn to lose this time.”
Meanwhile, American Jordan Spieth impressed with a seven-under 65 to secure a share of third alongside Italy’s Francesco Molinari, while Tiger Woods carded a round of 74 to finish 29 shots behind winner Lingmerth in last place after the worst round of his career on Saturday.