Florida native Daniel Berger moved five strokes clear ahead of the final day at the Honda Classic, matching the largest 54-hole lead in tournament history on Saturday.
The world number 20 had held a three-shot lead at the halfway mark but extended that with a one-under-69 following back-to-back 65s at Palm Beach Gardens in Florida.
Berger led by as many as six strokes after sticking a brilliant tee shot for birdie on the par-three 15th hole before a bogey on the 18th hole.
The American leads from a group of four players tied on six-under, including Irishman Shane Lowry who carded a round of six-under-67 to move up the leaderboard.
Lowry is tied with Sepp Straka, Chris Kirk and day one leader Kurt Kitayama, with the latter two carding rounds of one-over-71 having been tied for second after the first two days.
“Obviously you want to go out and catch him tomorrow, but I don’t think you can go and catch anyone on this golf course," said Lowry, whose round was the best of the day with only 13 players above even.
“You just need to do your thing and shoot the best score you can and hopefully it will be somewhere near good enough."
Lowry's round included four birdies and a bogey, while he drained a 20-foot putt on the sixth hole to save par.
Canadian Adam Svensson is one stroke back from the quartet at five-under, before a three-shot gap to the next in the field.
Pre-tournament favourites Brooks Koepka and Louis Oosthuizen are both well back, at one-over and two-over overall respectively.
Simpson appointed first vice captain for 2025 U.S. Ryder Cup team
Keegan Bradley has selected former U.S. Open champion Webb Simpson as his first vice captain for the 2025 U.S. Ryder Cup team.
Simpson, who is a seven-time winner on the PGA Tour, has lost all three of his appearances in the biennial men's golf competition.
The 38-year-old won the U.S. Open in 2012 to secure his first major championship win, and has triumphed in the Presidents Cup on three ocassions.
The United States will look to reclaim the Ryder Cup trophy at Bethpage Black in New York next September, having seen Europe win 10 of the last 14 competitions.
"Webb is someone who I have long admired and respected as a competitor and friend," U.S. captain Bradley said.
"He possesses a wealth of team golf experience and knows what it takes to win.
"Webb will be a valuable member of our leadership team and a trusted resource for me as we prepare for Bethpage Black next September."
"I am honoured to be chosen by Keegan to serve as a vice captain in 2025," Simpson added.
"Competing in three Ryder Cups will forever be among my career highlights.
I have no doubt that Keegan will be a fantastic captain and a tremendous leader, and could not be more excited to get to work as we seek to reclaim the Ryder Cup at Bethpage Black."
The Open: Victorious Schauffele eyes career grand slam
Xander Schauffele set his sights on a career grand slam after a brilliant final round saw him claim victory at The Open on Sunday.
Schauffele managed a six-under 65 through his fourth round at Royal Troon, with a run of four birdies in six holes down the back nine seeing him pull clear.
He finished two strokes ahead of Justin Rose and Billy Horschel, with Thriston Lawrence, Russell Henley and Shane Lowry rounding out the top of the leaderboard.
Having also triumphed at the PGA Championship at Valhalla earlier this year, Schauffele has become the first player since Brooks Koepka in 2018 (U.S. Open and PGA) to win two majors in the same year.
Rory McIlroy was the last player to win those same two tournaments in one year, achieving the feat back in 2014.
Only five players have ever previously won all four majors in their careers – Gene Sarazen, Ben Hogan, Jack Nicklaus, Gary Player and Tiger Woods.
Schauffele is looking to follow in their footsteps in the coming years, telling reporters: "If you look hard enough, you can always find it.
"It's something, when you feel like you need an extra kick in the butt, there's several easy ways to motivate yourself.
"There's still a lot of things that I'd like to do in my career, and this is a very big leap towards that. The fire is still burning, maybe brighter than ever."
Looking at the Claret Jug in his post-tournament press conference, the world number three added: "It's an honour. I've always dreamed of doing it.
"That walk up 18 truly is the coolest with the yellow leaderboards and the fans and the standing ovation. It really is one of the coolest feelings I've ever had in my life."
The Open: Rose lauds 'cold competitor' Schauffele after second-placed finish
Justin Rose accepted he had lost out to a "cold competitor" in Xander Schauffele after the American triumphed at the 152nd Open at Royal Troon on Sunday.
Schauffele shot a magnificent final round of 65 to seal a two-shot victory in Scotland, winning his second major after he also came out on top at May's PGA Championship.
Rose joined Billy Horschel in a share of second, the Englishman managing two birdies in his final three holes to close the gap.
Rose – who has gone 11 years without winning a major since claiming the U.S. Open title in 2013 – was proud of his efforts and acknowledged he had simply been beaten by the better player.
"Obviously I tried to enjoy the walk down 18 because we did an incredible job out there," Rose told Sky Sports. "I felt like we played unbelievable golf.
"But Xander, every credit to him, he made it look so easy on the back nine. He's a cold, cold competitor, but I couldn't be more proud of myself with the way I competed today.
"There was just one little spell in the round where there were putts on 12, 13 and 14 that didn't drop and that's where the momentum shifted to Xander.
"That putt on 18, to finish strong, I knew it was for second place and I think I at least deserved that for the week.
"It's okay to be beaten by someone who shoots 31 on the back nine but I gave that everything."
Fellow runner-up Horschel, who held a one-stroke lead going into Sunday's final round, was disappointed to drop away, saying: "I'm going to always fight until the end. I was rewarded with three birdies there at the end to finish tied second with a good friend, Justin Rose.
"I should feel disappointed. I had a chance to win a major. I was in a really good position. I just made a few too many mistakes today when I didn't need to.
"But we'll look back on this in an hour and I'll be very happy with what I did this week.
"I did a lot of great things that I can take on to the next few years of majors and hopefully one of these will be my time to step through the door and hold one of them."
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