BLAINE, Minn. — A 21-year-old who turned professional barely a month ago is on the verge of one of the more improbable breakthrough wins of the PGA Tour season, holding a three-shot lead entering the final round of the 3M Open at TPC Twin Cities.

Jackson Koivun, playing in just his 13th career PGA Tour start and third as a professional, fired a bogey-free 10-under 61 in Saturday's third round, highlighted by a tournament-record back-nine 28 that included two eagles. The performance vaulted him to 20 under par through 54 holes, tying the 3M Open's 54-hole scoring record of 193 set by wire-to-wire 2023 champion Lee Hodges.

Koivun's meteoric rise

Koivun enters Sunday having already established himself as one of the most decorated amateurs in recent college golf history. At Auburn, he became the first player ever to win college golf's three most prestigious individual honors — the Jack Nicklaus Award, the Ben Hogan Award and the Fred Haskins Award — in back-to-back years, cementing his reputation before he ever teed it up as a pro. He turned professional last month, forgoing his senior season, and earned his PGA Tour card through PGA Tour University Accelerated.

Despite the lack of professional experience, Koivun has shown no signs of nerves under pressure. Describing his........

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