Nick Taylor grabbed a one-stroke lead at the Shriners Hospitals for Children Open as Brooks Koepka made a slow start to his season on Thursday.
Canada's Taylor fired an 8-under 63 in the opening round in Las Vegas to edge into the lead ahead of Brian Harman (64).
Eyes were on world No. 1 Koepka, who is making his first appearance of the 2019-20 PGA Tour season.
The American four-time major champion underwent a procedure on his left knee after the FedEx Cup playoffs and he was below his best in the first round in Nevada.
Koepka endured a rollercoaster round with four bogeys and four birdies through his first 15 holes, before picking up a shot at the last to shoot a 1-under 70 and be tied for 85th.
Brooks' younger brother, Chase, fared far better, managing a 5-under 66 to be tied for eighth.
— PGA TOUR (@PGATOUR) October 4, 2019
Phil Mickelson is among a group of five players who are tied for third at 6 under.
The American veteran carded a 65 to sit alongside Brian Gay, Sam Ryder, Brian Stuard and Maverick McNealy.
— PGA TOUR (@PGATOUR) October 3, 2019
On what is a congested leaderboard, there are 12 players tied for eighth, including defending champion Bryson DeChambeau and Adam Scott.