The 25-year-old closed with a superb eight-under 64 at PGA West Stadium Course which included pivotal birdies on holes 16 and 17 from four feet and 19 feet respectively to overhaul Cantlay, who had set the clubhouse mark at 21-under following a blistering course record 61.

Australian Cameron Davis finished third for his career best result on Tour after a closing 64 while American Tony Finau, one of the overnight leaders with Kim and Max Homa, settled for fourth place following a 68.

Kim maintained his cool despite a jam-packed leaderboard and kept the bogeys off his card for a third time this week. He made birdies on Hole Nos. 4, 5, 7, 8, 10 and 11 to stay in the title chase before producing a glorious finish to pip World No.10 Cantlay.

Coincidently, Kim’s last victory at the 2017 Players Championship, the Tour’s flagship tournament, was at the Stadium Course at TPC Sawgrass, which designer Pete Dye also designed the Stadium Course at PGA West here in La Quinta, California.

“I had many chances since Players but I couldn't make it. Finally I made it. I tried to keep my composure and I made it. I'm so happy,” said Kim, who totalled 23-under 265 and moved up to ninth place on the FedExCup points list with his victory.

“I had many chances since Players but I couldn't make it. Finally I made it. I tried to keep my composure and I made it. I'm so happy." – Si Woo Kim

“When I had the chance to win (previously), I didn't play very well. I had a lot of ups and downs as I tried to play aggressive and that actually made me lose. My coach (Claude Harmon) talked to me about it a lot and even this week, he told me there will be chances anytime and to keep waiting and be patient, keep composure, and believe in yourself. That's what I tried to do.”

After making a two-putt birdie on the par-5 16th hole to tie Cantlay, Kim seized his moment at the par-3 17th hole by draining a long effort to snatch the outright lead before holding on to victory with a regulation par at the last hole.

“After I made birdie on No. 16, I felt more confident. I felt more comfortable. I wanted to have the least mistake on 17, at least make the playoff, so I tried to focus on the speed and then Max Homa's putt helped me as I knew how it (the ball) goes. I focused on the speed and I hit it very confidently,” said the Korean.

Sunday’s victory made Kim the Korean with the second-most wins after trailblazer K.J. Choi, who holds eight PGA Tour victories. “It feels great to become the second (highest) player. I cannot say I will achieve what K.J. Choi did because he did a great job. My goal this year is to have a win and I got it already and I just want to have one more win and then I try to get into the Tour Championship,” said Kim.

Cantlay, who won the ZOZO Championship last October, sank a career-high 11 birdies to set a new course record by two shots but came up just shy of a fourth PGA Tour victory. “I thought I would have a chance at a playoff. I know that they still had a bunch of holes left and, really, I put myself so behind the eight-ball making the cut just on the number and played unbelievable this weekend. I did everything I could, just going to be a shot short,” said the 28-year-old.