Scottie Scheffler had to settle for a round in the 70s for the first time since June while Ben Griffin carded an eight-under 64 to sit in a share of second place as 10 of the US Ryder Cup team teed it up in round one of the Procore Championship.
All but two of the 12 players who will take on Team Europe at Bethpage Black from September 26-28, live in full on Sky Sports, are in the field this week in Napa, California.
Bryson DeChambeau is ineligible for PGA Tour events as he plays on the LIV Golf circuit, while Xander Schauffele is spending time with his newborn son.
Scheffler had recorded 21 consecutive rounds in the 60s but finished with a two-under 70 on Thursday as he parred each of the par fives.
Griffin put in the strongest performance of the Ryder Cup contingent with five bir