BLAINE, Minn. Three days into the 3M Open, the golf course has already written itself into the record book twice. Friday belonged to Michael Kim, whose 12-under 59 is the second-lowest round in PGA TOUR history. Saturday belonged to Jackson Koivun, whose 10-under 61, built on a back nine of 28 with eagles at the 12th and 18th, ties the tournament's 54-hole scoring record. Both men needed TPC Twin Cities to be generous, and both found it exactly that generous. What Sunday needs is different. It needs someone to hold a number rather than chase one, and that assignment belongs to a 21-year-old with three months of professional starts to his name.
Koivun stands at 20-under 193, three shots clear of Emiliano Grillo and Ben Kohles at 17-under. It is the first time in his career, at any level, that he has led a tournament after any round. Sunday will ask him to do something he has never had occasion to do before: protect one.
The situation
The leaderboard compresses quickly beneath the top three. Michael Brennan and Chandler Phillips share fourth at 16-under, four back. Denny McCarthy and Michael Kim, a day removed from the round of his life, share sixth at 15-under, five back. Scottie Scheffler sits in a tie for ninth at 14-under, six adrift, after a Saturday 64 that included the only eagle anyone made at the drivable 16th hole. Further back, Kurt Kitayama's title defense continues at 10-under, 10 shots behind, a number that has settled the question of whether he will become the first repeat champion this tournament has had. He will not, not from there.
The number worth carrying into the afternoon: 54-hole leaders or co-leaders have converted 10 of this season's 30 individual stroke-play events on TOUR, just under one in three across the sport as a whole. In seven prior editions of the 3M Open, four winners, Jhonattan Vegas in 2024, Lee Hodges in 2023, Michael Thompson in 2020 and Matthew Wolff in 2019, have held at least a share of the 54-hole lead. The largest final-round comeback in the event's history is five strokes, by Tony Finau in 2022, two shots more than the three-shot deficit facing Grillo and Kohles. Everyone further behind needs something this tournament has not yet produced.
Who holds the advantage
Koivun's case rests on the same thing that built his lead: a golf swing that has looked, for three days, entirely unbothered by the moment. He arrives having already beaten a national championship field at Auburn, having already stood at 5-over at Shinnecock Hills in a U.S. Open and shared low-amateur honors, having already made the leap from PGA TOUR University Accelerated membership to Saturday's tournament-record round in the space of a few months. His most recent finish before this week, a tie for 10th at the ISCO Championship, hardly suggested a leaderboard-record 61 was imminent. Neither did his professional debut, a missed cut at the John Deere Classic. The talent has been evident since college. Its arrival at exactly this magnitude, on exactly this Sunday, is the part nobody could have scripted.
What he has not done is close. No professional Sunday has tested him yet. A win would make him the fourth rookie to win on TOUR this season, after Alex Fitzpatrick, Kristoffer Reitan, and Stefano Mazzoli, each of whom found a way to make a maiden appearance in contention count. Whether Koivun's game, which has produced two rounds of 68 or better in three tries this week, travels into a final round with a number attached to it is this Sunday's central question.
Who lurks
Emiliano Grillo has the steadiest case of anyone chasing. Three rounds in the 60s, his best 54-hole total of the season, and a history at TPC Twin Cities that already includes three top-10 finishes across six prior visits. A win would be his third TOUR title and would make him just the second international champion this event has had, after Jhonattan Vegas in 2024. Ben Kohles has stood inside the top three after every round this week, starting with Thursday's career-low 62, and arrives still seeking his first PGA TOUR title in his 122nd start after five wins on the Korn Ferry Tour. Both know the specific weight of the number they are chasing. Neither has anything to lose that they did not already risk by Thursday.
Then there is Scheffler, six shots back, whose presence changes the math for everyone ahead of him regardless of what the scoreboard currently says. He has come from seven or more strokes back after 36 holes to win three times before, at the 2022 WM Phoenix Open, the 2022 Arnold Palmer Invitational, and the 2025 Procore Championship. But he has never won from more than five strokes back through 54 holes on TOUR; his largest such comeback, at the 2024 PLAYERS Championship, closed a five-shot gap with a final-round 64. Six shots at TPC Twin Cities is not nothing, not on a course that has already yielded a 59 and a 61 this week. It is also not a margin his own history says he has cleared before.
Michael Brennan and Chandler Phillips, four back, have both played their best golf of the year this week, Brennan with his lowest score in 88 TOUR rounds on Saturday, Phillips with three consecutive rounds in the 60s that have kept him among the tournament's leaders all week. Michael Kim, a day after the second-best round in TOUR history, sits five back at 15-under, a reminder that a 59 does not guarantee anything about the round that follows it. Denny McCarthy shares his number, still hunting a first title in his 232nd start, one of the more decorated names on the list of TOUR players who have never won.
What the course will demand
Sunday arrives hot and humid, the temperature forecast to climb into the upper 90s with a heat index expected to clear 100 degrees by midday and peak near 105 in the afternoon. Winds build out of the south-southwest through the day, sustained at 10 to 15 miles an hour with gusts approaching 20, and an isolated shower or thunderstorm cannot be ruled out late in the round, though the higher chance of scattered activity is expected to hold off until evening. It is the kind of afternoon that tests concentration as much as ball-striking, four and a half hours in a heat index above 100 with a leaderboard that has offered no evidence all week that anyone can simply park on a number and wait.
TPC Twin Cities gave up five rounds of 62 or better a year ago, and this week has already exceeded that pace by Saturday night. A course this generous does not typically reward defensive golf, which means Koivun's three-shot cushion may be less secure than the arithmetic suggests. The players chasing him have every incentive to keep attacking, and the course has given them every reason to believe attacking works.
The likely turning point
Watch the front nine first. Koivun built Saturday's record on his back nine; whether he can construct something similarly clean on his front nine today, before the temperature and the pressure both crest together in early afternoon, will say a great deal about whether Sunday becomes a coronation or a contest. If Grillo or Kohles can find red numbers early, while the heat is still climbing rather than smothering, the gap that looked comfortable at sunrise will not stay that way for long. And if Scheffler, six back, finds anything resembling the front nine he played to close Saturday, TPC Twin Cities may yet answer the one question its short history has never had occasion to ask: what happens when the game's best player finally gets within range on a course he has never played before this week.
Twenty-under is the number the leaderboard shows this morning. What matters is whether it is still the leader's number when the heat finally breaks tonight.