Patrick Cantlay matched the 18-hole course record to close the first round at the AT&T Pebble Beach Pro-Am as the leader.
Kim Si-woo secured his third PGA Tour title, winning The American Express.
Bryson DeChambeau headed into the Masters in bullish mood, yet the big hitter appears at risk of missing the cut at Augusta.
Patrick Cantlay claimed his third PGA Tour victory, winning the Zozo Championship.
Justin Thomas leads the Zozo Championship, but Jon Rahm made his move in California.
Martin Laird and Patrick Cantlay top the leaderboard after 54 holes in Las Vegas.
There is a log-jam atop the leaderboard heading into the weekend, while Bryson DeChambeau remains within striking distance.
Canadian golfer and one-time PGA Tour winner Nick Taylor carded a bogey-free eight-under-par 63 in California.
No team had ever won the Presidents Cup after trailing at the start of the final round. But the USA changed that on Sunday.
Tiger Woods and the United States celebrated yet another Presidents Cup triumph after rallying past the Internationals.