Veteran Australian Rod Pampling carded an opening-round 60 to tie the course record at TPC Summerlin and take the clubhouse lead in the Shriners Hospitals for Children Open.
The 47-year-old from Queensland shot seven birdies and two eagles in Las Vegas, with pars on the final two holes seeing him miss out on breaking the mark set by American JJ Henry in 2013.
Pampling's 11-under par put him ahead of John Huh and Ryder Cup player Brooks Koepka, who are both two shots back.
"When I hit it close on 16, that got my attention as this is a really good round. The putt on 17 just fell short in the jaws and on 18 I gave myself a bad read. I thought it was straight, but it just had that little left-to-right," Pampling said on www.pgatour.com.
"I would have loved to have made one for a 59, but it was just a good solid day all around."
Pampling added: "I think I need to get in the 20s (under) to have a chance for the win, so we will just keep working and also make sure not to get ahead of ourselves.
"It's great to get off to a good start, there's some life left in me yet, and hopefully we keep it going."
Northern Irishman Graeme McDowell is 10 shots off Pampling after his opening one-under-par 70.
McDowell's four birdies were undermined by a double-bogey on the par-four tenth, to leave him in a tie for 62nd.
