Kim Si-woo claimed his first PGA Tour win in almost four years with a one-stroke victory at The American Express on Sunday.

The South Korean carded an eight-under 64 in the final round at the PGA West Stadium Course to finish at 23 under.

It was enough for Kim to win his first PGA Tour crown since May 2017 and third overall.

Kim's win came despite a spectacular final round from Patrick Cantlay, who fired a stunning 11-under 61.

Cantlay broke the course record on the back of 11 birdies.

Australian Cameron Davis finished outright third after a fine eight-under 64 in the final round.

Tony Finau and Max Homa were tied for the overnight lead with Kim, but they slipped back to finish fourth and tied for 21st respectively.

Abraham Ancer (66), Michael Thompson (66) and Doug Ghim (69) finished at 15 under.

Tony Finau is part of a three-way tie for the lead heading into the final round of The American Express.

The American, whose only previous PGA Tour win came at the Puerto Rico Open in 2016, fired a five-under 67 in the third round in California on Saturday.

Finau was four under through 12 holes in his round before finding water and making a double bogey at the par-three 13th.

But he responded in style, reeling off three straight birdies to get to 15 under – which sees him share the lead with Max Homa (65) and Kim Si-woo (67).

Finau has eight top-10 finishes at majors, but on Sunday will bid to end his wait for a second PGA Tour victory.

Homa, meanwhile, had a double bogey after finding water on the seventh, while Kim went through bogey-free on the PGA West Stadium Course, which hosted the third round.

Richy Werenski (65) is a shot back of the leading trio, while Russell Knox (64), Brian Harman (67) and Emiliano Grillo (68) are at 13 under.

Cameron Davis (66), Rory Sabbatini (67), Chase Seiffert (65), Francesco Molinari (69) and Doug Ghim (69) are tied for eighth.

Molinari, the 2018 Open Championship winner, is playing for the first time since last year's Masters, having missed five cuts in seven events in 2020.

Overnight leader Im Sung-jae slipped back to a tie for 20th after finding the water three times during his round, including twice at the ninth.

Im Sung-jae leads The American Express by one shot after the second round, while Phil Mickelson made history on the PGA Tour despite missing the cut.

South Korean golfer Im carded a seven-under-par 65 on the PGA West Stadium Course to hit the front in California on Friday.

Im – who finished tied for second at last year's rescheduled Masters, and is eyeing his second Tour title after breaking through at the 2020 Honda Classic – was flawless with seven birdies and no bogeys.

The 22-year-old is 11 under at the halfway stage of the tournament, ahead of Nick Taylor (66), Tony Finau (66), Abraham Ancer (65), Kim Si-woo (68) and overnight leader Brandon Hagy (70).

Defending champion Andrew Landy posted a second-round 69 to be tied for 37th and six strokes off the pace.

In his 2,201st career PGA Tour round, five-time major champion Mickelson carded 18 consecutive pars for the first time.

Mickelson – playing for the first time since November's Masters – following his opening-round 74 with a 72 as the American star finished seven shots outside the cut line.

"For that to be the first time, it's really shocking,” said Mickelson. "Surprising, because I really try to hit fairways and centers of the greens and just make easy pars.

"Looking at the scores, you're going to say, 'Gosh, you played two-over par, pretty easy courses, pretty poor start'. But I feel like there were a lot of good things to take from the week, even though the scorecard’s not going to show it."

Brandon Hagy carded an eight-under 64 to take a one-stroke lead after the first round of The American Express on Thursday.

Hagy made 10 birdies and two bogeys during his first round on the PGA West Nicklaus Tournament Course in California.

The American sits a shot clear of Byeong Hun An, who fired a 65 on the same course.

Hagy is in the lead through 18 holes for the second time in his PGA Tour career and first since the 2017 Canadian Open.

Kim Si-woo produced the best round of players who started on the PGA West Stadium Course, his 66 – which featured an eagle at the fifth hole – seeing him sit tie for third.

Martin Laird and Max Homa are alongside Kim, two shots adrift of Hagy.

A group of nine players opened with 67s, including Charl Schwartzel and Alex Noren.

Defending champion Andrew Landry, meanwhile, carded a two-under 70 on the Stadium Course to be back in a tie for 61st.

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