Jackson Koivun, a 21-year-old rookie, leads the field entering the final round of the 2026 3M Open after completing 54 holes. Multiple outlets report that Koivun posts a tournament-record back nine of 28 during his Round 3. In that stretch, he records two eagles, a performance that helps his overall score hold up at the top of the leaderboard. Yahoo Sports describes the finish as near as many eagles as pars on the back nine, while both Yahoo Sports and Forbes note the size of his advantage going into Sunday play. According to the reports, Koivun holds a three-shot lead over the rest of the field. The coverage agrees that the key factor in his position is the record-setting back nine, which turns him into the outright leader at the halfway point of the tournament schedule for the final round. All sources frame his current lead as setting up the final round, with Koivun positioned to contend for the title after his strong third-round performance.