Wesley Bryan carded a seven under par 64 to claim a one stroke lead at the rain-interrupted John Deere Classic on Friday.
Bryan, who only received his PGA Tour card earlier this year after claiming a trio of victories on the Web.com Tour, is still looking for his first win in a PGA Tour event.
"Been hitting the ball great all week, really the last couple weeks," the 26-year-old said after his round.
"Struck it well, made the putts when I needed to, and here we are."
The American struck seven birdies in his flawless round to move to a score of 12-under through 36 holes at the Deere Run course in Silvis, Illinois.
"Knowing that I've been there and been able to hit the shots under pressure, I think should help me out moving forward," he added.
After starting his round on the 10th, he notched birdies on 12, 13, 14, 17 and 18 to reach the turn on 31.
In second place, one stroke behind the leader is Steve Marino on 11-under, after he carded a 65. In third is first round co-leader Tom Gillis, who followed up his opening 64 with a 68 on Friday.
Kyle Stanley is another stroke further back on nine-under after a second round 66, with five golfers tied at eight-under, one of which is Kelly Kraft, who is yet to complete his second round.