Adam Hadwin etched his name in history as he soared into a one-stroke lead after the third round of the CareerBuilder Challenge.
Before 2017, only six players in PGA Tour history had shot a 59, but Hadwin became the second player to accomplish the feat already this year when he carded a 13-under-par 59 on Saturday.
Hadwin joined Justin Thomas, who did it at the Sony Open earlier this year, Al Geiberger, Chip Beck, Stuart Appleby, Paul Goydos, Jim Furyk and David Duval as the only players to shoot 59 in a Tour round.
The 29-year-old Canadian remarkably had 13 birdies and five pars on his historic round at La Quinta Country Club, with his birdie barrage matching Chip Beck's record for most birdies in a round.
Hadwin is 17 under through 54 holes, just ahead of Tour rookie Dominic Bozzelli.
Bozzelli had four birdies and a bogey for a third-round 69.
Overnight leader Hudson Swafford is a stroke further back after dropping two places down the leaderboard, alongside Brian Harman (69), Bud Cauley (65) and Chad Campbell (66).
Returning veteran Phil Mickelson shot a one-over-par 73 to be nine under overall, eight shots off the lead.