Professional golf experienced a tidal wave of excitement over the weekend when Koivun, 21, won the PGA Tour's 3M Open.

PGA Tour rookie Jackson Koivun shot a 61 in the third round of the 3M Open to take a three-stroke lead at 20-under par.

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…