Peter Uihlein shook off an early bogey to card a five-under par 66 and stretch his lead to two strokes midway through the US PGA Tour Shriners for Children Open.
Uihlein, whose first-round 63 on Thursday was fueled by birdies at three of his first six holes, bogeyed the par-four second at TPC Summerlin in Las Vegas, Nevada.
A birdie at the fourth saw him make the turn even for the day, but he produced five birdies on the back nine to build a 36-hole total of 13-under par 129 -- two shots clear of fellow American Robert Streb and South Korean Kim Whee.
"I just kept trying to hit fairways and greens, get a bit more stable with it, I guess," said Uihlein, who has hit 32 of 36 greens over the first two rounds.
"Made an unbelievable par on six, which kind of righted the ship, and then after that I was pretty efficient, hit a lot of fairways, lot of greens. I felt like if I just did that I'd give myself a lot of chances the hole would eventually open up and the ball would start going in."