The Spaniard posted a five-under 67 on the Nicklaus Tournament Course at PGA West, which has him at 15-under 129 through 36 holes, one back of leader Andrew Landry.
Landry shot a 7-under 65 today on PGA West's Jack Nicklaus Tournament Course to reach 16 under.
The PGA Tour player found the sand with his ball in the first round of the ongoing CareerBuilder Challenge at La Quinta in California.
Four more birdies followed on the back nine for a bogey-free opening round, as the 23-year-old took full advantage of favourable conditions with a one-stroke lead.
First-round co-leaders Gene Sauers and Jerry Kelly each shot 68 and were 12 under. Many will remember the University of Arkansas alum from when he earned a spot in the final group on Sunday of the 2016 U.S. Open at Oakmont, but Landry has put together a solid resume since, winning his second Web.com Tour event in 2017 and registering six top-five finishes.
Seamus Power is in a tie for 88th after a round of 70 with six birdies and four bogeys for the Waterford man.More news: Syria warns it will down warplanes from Turkey
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At 14-under 130 is Jason Kokrak, who shot a five-under 67 on the Nicklaus Course.
"But I think I'm doing an all-right job so far", he said.
Among a group four shots back at 12-under 132 is Nick Watney, who posted a five-under 67 at La Quinta Country Club to go with his opening round seven-under 65 on the hard Stadium Course at PGA West. He short-sided himself in the left bunker on the par-3 12th for his first bogey of the week and three-putted the par-4 14th - pulling a 3-footer and loudly asking "What?" - to drop another stroke. "La Quinta's still really pure, right out in front of you, as is the Nicklaus".
"The scores obviously aren't what I want, but it's pretty close and I feel good about my game", Mickelson said.
"It's all thanks to the start I had". My iron play has been poor relative to the standards that I have.
"It was a little down in the rough", said Reiter, the Palm Desert High School senior who recently played with Rahm at nearby Big Horn. He tied for 65th in the Australian Open in November in his first start in a professional tournament.