Kim Si-woo of South Korea celebrates after winning the Players Championship at TPC at Sawgrass in Ponte Vedra Beach, Florida, on Sunday.
Australia's world No.3 Jason Day claimed an unwanted record for the worst-ever final round by a defending champion since the Players moved to TPC Sawgrass in 1982, signing for an 80.
Ian Poulter of England, shows his ball after making a birdie putt on the 11th hole, during the final round of The Players Championship golf tournament Sunday, May 14, 2017, in Ponte Vedra Beach, Fla.
Kim claimed his second win on the PGA Tour in just his second appearance in the tournament after finishing tied for 23rd a year ago in his debut at The Players.
"While I was practicing with him, he taught me about the course at the Stadium", Kim said.
Kim said he wasn't nervous because of his victory last year in the Wyndham Championship, which gave him a two-year exemption on the PGA Tour.
His best hope was a mistake from Kim, who played bogey-free for a three-shot victory.
Hideki Matsuyama, Justin Thomas, Jon Rahm and Pat Perez round out the top five in the FedExCup standings.
Without so much as a deep breath, the 21-year-old from South Korea drew back his wedge, fired it at the middle of the green and resumed his march into the record book as the youngest victor of The Players Championship in its 44-year history. In only six starts on the season, McIlroy is now No. 48 in the FedExCup standings.
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"If you're on your game and playing well, that the things you do", Oosthuizen said.
Spain's Rafa Cabrera-Bello finished in a tie for fourth.
"Regardless of me winning this tournament, I really have to go to the military service, and I've already decided I'm going to go, too, so I'm ready for that", Kim said.
The South Korean started the final round two strokes adrift of the lead held by American pair Kyle Stanley and J.B Holmes.
A total of 66 PGA Tour golfers have earned more than $1 million over the course of the 2017 season so far, but that doesn't mean that some players aren't trying to save money when possible.
Less than a month ago Poulter thought he had lost his card on the PGA Tour after failing to earn enough points in a certain number of events this season having recovered from a foot injury that badly affected his 2016 campaign.
He played last four holes in just eight shots, starting with the first albatross in TPC Sawgrass history when his 8-iron on the par-5 16th hole caromed off the bank of a bunker and ran into the pin before dropping for a 2.
Despite Kim's win, he looks set to spend two years away from the game.