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BLAINE, Minn. — Jackson Koivun won the 3M Open by three strokes Sunday in only his third start as a professional, holding off Scottie Scheffler with a closing 5-under 66 for a tournament-record 25-under 259 total. Koivun played a safe and steady game on a 97-degree afternoon at the TPC Twin Cities, going bogey-free for the second straight day after a 61 on Saturday gave him a three-shot cushion. The 21-year-old player who led Auburn to the NCAA championship last month confidently fended off the world's top-ranked player in Scheffler, who surged into contention with a 63 while playing five...