BLAINE, Minn. The heat that had been forecast all week arrived on schedule, the temperature reaching 97 degrees under a partly cloudy sky with a gusting south-southwesterly wind, and Jackson Koivun played through all of it without dropping a shot. His final-round 66 at TPC Twin Cities was bogey-free, the third bogey-free round of his four this week, and it turned a three-stroke overnight lead into a three-stroke victory that never seriously wavered. He finished at 25-under 259, a new 72-hole scoring record for the 3M Open, one stroke better than the mark Lee Hodges set in 2023. He is 21 years old, two months and three days into a birthday, and he has now won a PGA TOUR event in his 13th career start, his third as a professional.
The round
There is a version of Sunday golf that is about survival, about protecting a number against a field that keeps attacking, and Koivun's final round was not that version. He played the way he had played all week, the approach play that had carried him to a tournament-record back nine on Saturday simply continuing into a fourth day. He led the field for the week in Strokes Gained: Approach the Green and proximity to the hole, and ranked third in both Strokes Gained: Putting and Strokes Gained: Tee to Green. The consistency across every category is the story underneath the score. Nothing carried him. Everything did.
The only real pressure of the afternoon came from behind, and it came from the largest possible source. Scottie Scheffler, six shots back at the start of the day, played a bogey-free 63, the low competitive round among the leaders, to finish at 22-under 262. It is his fifth runner-up finish of the season and his 87th top-10 in 167 career starts, and it briefly made the gap interesting. It did not make it close. Koivun's bogey-free card left no opening for the deficit to matter.
The résumé
Koivun's rise from college golf to a PGA TOUR title took less than four months. He turned professional in June, after leading Auburn to its second national championship in three years and finishing his collegiate career with 11 victories, a program record and a share of seventh all-time in NCAA history. He became the first player in the sport's history to win the Haskins, Hogan, and Nicklaus awards twice, first as a freshman in 2024 and again as a junior this year. Before turning professional he spent 56 consecutive weeks ranked No. 1 in the World Amateur Golf Ranking, the third-longest reign on record behind only Keita Nakajima and Jon Rahm, and he had the option to turn professional a full year earlier, in June 2025, but chose to return to Auburn for his junior season instead.
The decision to wait cost him nothing. He earned his TOUR card through PGA TOUR University Accelerated, finishing with 42 points against a 20-point threshold, becoming the third player to reach the TOUR through that route after Vanderbilt's Gordon Sargent and Florida State's Luke Clanton. His professional debut, at the John Deere Classic, ended in a missed cut. His next start ended in a tie for 10th at the ISCO Championship. Neither hinted at what TPC Twin Cities was about to produce.
He is the fourth rookie to win on the PGA TOUR this season, joining Alex Fitzpatrick, Kristoffer Reitan, and Stefano Mazzoli, and the third to claim a maiden title within his first 13 starts, a list that now includes Fitzpatrick's 11th start and Mazzoli's third. He is the youngest player to win on TOUR since Aldrich Potgieter at last year's Rocket Classic, and the youngest American to win by multiple strokes since Ralph Guldahl at the 1932 WM Phoenix Open, a gap of nearly a century. The win moves him to 500 FedExCup points and No. 70 in the standings, up from No. 194 the week he arrived in Blaine.
The men he beat
Behind Scheffler, four players shared third at 20-under 264. Hideki Matsuyama played the final three rounds in 65-65-64, closing with a back nine of 30 that included a birdie-eagle finish, for his third top-10 of the season. Brian Harman played the last 54 holes bogey-free after an opening bogey, his best finish since a tie for 10th at last year's Open Championship. Chandler Phillips, who had stood among the leaders since Thursday, closed with a 67 for the best finish of his season, climbing from 103rd to 86th in the FedExCup. Denny McCarthy birdied three of his last four holes and finished his week leading every player in the field in Strokes Gained: Putting, his best result since a runner-up finish at the 2024 Valero Texas Open.
Michael Kim, three days removed from the second-lowest round in PGA TOUR history, added rounds of 69 and 70 to finish tied for 10th at 17-under, a week that will be remembered for Friday regardless of where Sunday left him. And Jake Knapp closed with the low round of the final day, a 9-under 62 built on an 8-under back nine, to finish tied for 13th, a reminder that TPC Twin Cities kept handing out low numbers until the very end.
Kurt Kitayama's title defense closed at 13-under, a tie for 24th, ending his bid to become the first repeat champion in this tournament's seven-year history. It remains, for one more year, an event no one has won twice.
The week in the end
Three days ago this tournament belonged to Michael Kim's 59. Two days ago it belonged to a back nine of 28 that nobody outside Koivun's own group could quite believe. By Sunday night, both of those rounds had become the supporting material for a larger story: a 21-year-old, four months removed from college golf, closing a bogey-free week at TPC Twin Cities with a scoring record that had stood for exactly three years. The 3M Open has now produced two first-time winners in seven editions and a third this year in a rookie who arrived with almost no professional track record to speak of. What he leaves with is a tournament record, a three-stroke win over a major champion and a run of players who have combined for dozens of years on TOUR, and a question that will follow him into every start from here: how much of what just happened in Blaine was the beginning, and how much was already the whole story.