BLAINE, Minn. Saturday at TPC Twin Cities arrived hot, the temperature climbing to 94 degrees under a mostly cloudy sky with a manageable wind out of the west-southwest, and by the time it ended, the leaderboard had a new name at the top of it for the third straight day. Jackson Koivun shot a 10-under 61, the back nine alone worth 28 strokes on eagles at the 12th and 18th holes, to reach 20-under 193. It ties the lowest 54-hole score in the seven-year history of the 3M Open, a mark Lee Hodges set in 2023, and it gives the 21-year-old a three-shot lead into the first Sunday of his professional career with a chance to win.
The moment the round turned
Koivun's back nine did not build gradually. It arrived as a run: birdies mixed with two eagles across nine holes, a stretch of golf that produced the single lowest nine-hole score in this tournament's history and turned what had been a good round into a record one. He is now the youngest player to hold or share a 54-hole lead on TOUR this season, and Saturday marked the first time in his career, at any level of professional golf, that he has led after any round.
The path here has been fast even by the standards of a fast-rising talent. Koivun turned professional this spring after leading Auburn to its second national championship in three years and becoming the first golfer in college history to win the Haskins, Hogan, and Nicklaus awards twice. His professional debut, at the John Deere Classic, ended in a missed cut. His most recent start, the ISCO Championship, ended in a tie for 10th. In between, he made 10 starts as an amateur on TOUR, four of them consecutive finishes of a tie for 11th or better. None of it, not the Haskins, not the national title, not the exemption into this year's U.S. Open where he shared low-amateur honors at Shinnecock Hills, prepared observers for a Saturday like this one. A win Sunday would make him the fourth rookie winner on TOUR this season, joining Alex Fitzpatrick, Kristoffer Reitan, and Stefano Mazzoli.
The players who moved
Emiliano Grillo and Ben Kohles share second at 17-under 196, three back, having taken almost opposite roads to get there. Grillo's 65 was his third straight round in the 60s, the best 54-hole total of his season, and it keeps alive his bid to become just the second international winner in tournament history after Jhonattan Vegas in 2024. Kohles, Thursday's leader off a career-low 62, has now stood inside the top three after every round this week, still hunting a maiden PGA TOUR title in his 122nd start.
Michael Brennan carded his lowest round in 88 tries on TOUR, a 9-under 63, to reach 16-under 197 and a share of fourth with Chandler Phillips, whose 66 kept him inside the leaders for a third consecutive day. Brennan, the reigning Bank of Utah Championship winner, arrived this week ranked 105th in the FedExCup with three events left before the Playoffs cutoff, and Saturday put him back in the conversation he needed.
The players who slipped
Friday's story could not repeat itself, and Michael Kim's Saturday made the point plainly. A day after his historic 59, Kim added a 1-under 70, the most ordinary round of his week, and slid to a tie for sixth at 15-under, five shots off the new lead. He becomes the answer to his own trivia question: one round in the 50s, one in the 60s, one in the 70s, a stat line that belongs to almost no one else in TOUR history. Denny McCarthy shares that tie for sixth, still seeking a first title in his 232nd start, a number that ranks sixth on the list of active TOUR players without a win.
Scottie Scheffler had the single best individual moment of the day at the drivable, 296-yard 16th, holing out from the rough for an eagle, the only one anyone made there all round, en route to a back nine of 29 and a 7-under 64. It leaves him tied for ninth at 14-under, six shots back, still seeking a golf course he has never won on before, in a tournament no World No. 1 has ever claimed. He has never won from more than five strokes back through 54 holes; his largest comeback, the 2024 PLAYERS Championship, closed a five-shot gap. Saturday's 64 shows the game is there. The margin, for now, is not.
Kurt Kitayama's title defense continued to slip further from reach. The 2025 champion sits 10 back in a tie for 21st, his bid to become the 3M Open's first repeat winner increasingly a matter of what next year might bring rather than this one.
What tomorrow demands
History offers Koivun little comfort and no particular threat, in roughly equal measure. Four of the tournament's seven winners have held at least a share of the 54-hole lead, Jhonattan Vegas in 2024, Lee Hodges in 2023, Michael Thompson in 2020 and Matthew Wolff in 2019, against a TOUR-wide rate this season of 10 conversions in 30 stroke-play events. The largest final-round comeback in 3M Open history is five strokes, by Tony Finau in 2022, two shots more than the gap separating Koivun from the pair at 17-under. He takes a three-shot lead and a golf course that gave up a 59 on Friday and a record-tying 61 on Saturday into a Sunday where staying ahead may require doing something he has not yet had to do this week: play defense. Behind him, Grillo and Kohles both know what it is to chase a first or a third title on the same afternoon, Brennan and Phillips are hot enough to keep climbing, and further back, the World No. 1 has already shown Saturday that his game travels even when the leaderboard says otherwise. TPC Twin Cities has not made anyone look safe all week. There is no reason to expect it will start now.