Jackson Koivun's Presidents Cup debut ended with the swagger his clips promised

Jackson Koivun's Presidents Cup week ended with the kind of 18th-hole moment that makes a short video travel. The 21-year-old U.S. captain's pick stood over his tee shot with a relaxed air, then finished his singles match against Si Woo Kim with a 2-up victory. The PGA Tour's official recap says Koivun went 2-0-1 in his Presidents Cup debut.

The clip's confidence had a result behind it. Koivun fell two down early to Kim, then won three straight holes from Nos. 11 through 13 to take the lead. He added a birdie on the 15th, absorbed a Kim win on the 16th and answered with a birdie on the last hole to close the match.

A second PGA Tour Short captures the same week from a different angle, with commentary about Koivun's maturity and the small details of his first tee shot on Thursday. His presence stood out: he arrived as a first-time Presidents Cup player and looked comfortable in the event's noise.

That composure was part of the case for selecting him. The Presidents Cup's official team announcement listed Koivun as a 21-year-old making his first appearance. PGA Tour coverage before the event described him as the 2026 3M Open winner and quoted fellow rookie Jacob Bridgeman praising his mental game.

Koivun had already supplied the résumé line before he reached Medinah. In July, he won the 3M Open by three strokes over Scottie Scheffler, set the tournament's 72-hole scoring record at 25-under 259 and became the youngest American to win a TOUR event by multiple strokes since Ralph Guldahl in 1932, according to the PGA Tour.

Koivun's week had the substance to support the swagger: an undefeated record, a comeback in singles and a closing birdie that added another U.S. point during the Americans' comeback win.