Webb Simpson maintained a four-stroke lead Saturday in the Shriners Hospitals for Children Open, birdieing four of the last seven holes at TPC Summerlin.
Making his first start since helping the U.S. win the Presidents Cup, the 2012 U.S. Open champion shot a 4-under 67 to reach 19 under. He opened with rounds of 64 and 63.
"The conditions were perfect," Simpson said. "I knew guys were shooting low numbers. I felt like I was playing good enough. I just was shooting pretty bad — parred 9, dropped the shot at 11. So, it was frustrating.
"But my caddie just told me to stay patient and let the birdies come. And that's what happened. I made some putts coming in."
Chesson Hadley was second after a 67, reaching 15 under with an eagle on the par-5 16th. The Web.com Tour Championship winner last month, Hadley is making his fourth career PGA Tour start.
Jeff Overton was third at 14 under after a 68.
Jason Bohn had a 69 to reach 13 under, and Sean O'Hair shot a 63 to join first-round leader J.J. Henry, defending champion Ryan Moore, William McGirt, Ryo Ishikawa and Russell Knox at 12 under.
O'Hair eagled the par-4 15th.
"I've been playing some nice golf, and it was nice to come out today and get started off quick," O'Hair said. "I was 3 under pretty quickly and turned at 4, and kind of started off slow on the back nine, but that eagle helped on 15. So, it was just all in all a great day."
O'Hair had to play the four-event Web.com Tour Finals to regain his PGA Tour card.
"I think it was a tough time this year for me, especially late because I was realizing I was going to lose my card," O'Hair said. "I just had to get my mind right going into those Web.com events. I knew I had an opportunity to get my card back, but I had to be in a right spot mentality. It was a disappointing time for me.
"I was able to get my mind right, and I played fairly well. ... I really feel good about my game right now, everything about it, from putting, ball-striking. I really feel like I can play some great golf right now. I think it helped me to kind of go back to basics and simplify my game."
Henry has shot 71-70 after opening with a course-record 60. McGirt shot 64, Ishikawa had a 68, and Moore and Knox shot 69.
Daniel Summerhays had a 68 to reach 11 under. He eagled the par-5 13th and 16th holes.
Jimmy Walker, the winner of the season-opening Frys.com Open last week in California, was 10 under after a 64.