Tom Kim took advantage of a disastrous final hole from Patrick Cantlay to secure the Shriners Children's Open title on Sunday with an overall score of 24 under.
Kim, 20, became the first player since Tiger Woods to win two PGA Tour events before their 21st birthday, and he did it after coming into Sunday's final round tied for the lead with Cantlay.
The two players atop the leaderboard exchanged the lead multiple times, with Cantlay birdieing the opening hole, before Kim closed out his front-nine with back-to-back birdies to make the turn with a two-stroke advantage.
Cantlay evened things up with back-to-back birdies of his own on 11 and 12, before Kim banked another pair of birdies on 13 and 14, only for Cantlay to level the playing field with two more on 15 and 16.
Heading onto the 72nd and final hole of the week tied at 24 under, Cantlay teed off first and put it into the coarse bushes off the side of the fairway.
Instead of declaring it unplayable and taking a drop, he opted to try and play his way out, resulting in a botched first shot that traveled less than a yard, before putting his next shot in the water in a catastrophic meltdown.
Kim made no such mistake off the tee, finding the centre of the fairway before approaching safely onto the green and two-putting for the win, while Cantlay needed to sink a 36-foot putt for triple-bogey, tying for second at 21 under.
Speaking after the win, Kim highlighted his mistake-free play as the key to victory.
"I played really solid this week – I had no bogeys for 72 holes," he said. "I think I have to give big credit to Joe [Skovron], my caddy, he really kept me in it and we had a really good game-plan the week, and it paid off.
"I got very lucky on the 18th, I'm not going to lie. Patrick played awesome, and it was an honour to battle with him, and to come out on top, I feel very fortunate."
When asked if he was surprised by his early success on the PGA Tour, he said he is just enjoying the ride.
"I've worked really hard, and my team has worked really hard to get to this point," he said. "I'm just really grateful, and I'm very fortunate to have an opportunity like this. I'm having fun playing on the PGA Tour, it's awesome."
Finishing tied with Cantlay for second place at 21 under was Matthew NeSmith, and first-round leader Tom Hoge ended the week with some momentum as he posted a seven-under Sunday to shoot his way into a tie for fourth at 20 under with Mito Pereira and Kim Seong-hyeon.
Im Sung-jae was alone in seventh at 19 under, and Jason Day tied with Kim Si-woo for eighth, giving South Korea four of the top-10.