Rookie Brice Garnett held a one-shot lead at the halfway stage of the Crowne Plaza Invitational in Forth Worth, Texas.
The American carded three birdies and an eagle to finish on four-under for the day, with just one bogey blighting his second-round scorecard.
Garnett, who hails from Missouri, appears to relish playing in Texas - he achieved his first top-10 finish on the PGA Tour, a tie for seventh, six weeks ago at the Shell Houston Open.
"For some reason, it's just I've kind of adapted to Texas golf," he told the PGA Tour website. "Growing up back home in the spring and fall, it gets pretty windy as well. I kind of relish whenever the wind blows and (you have) kind of got to control your ball."
The 29-year-old is on seven-under overall, with Chris Stroud and Robert Streb both one shot behind.
Stroud had a disappointing first day but clawed his way back into contention by notching eight birdies, making five putts from beyond 20 feet with four of them coming on his final nine holes.
"Man, it sure is nice to make putts. I was so relaxed out there. It was obviously a little luck," he said.
"But the key is every putt I hit today, I hit really, really solid. I never really hit a bad putt."
A pack of seven ended the day still well in contention on five-under par.
One is South African Tim Clark, who returned four back-to-back birdies from the 12th to 15th holes. First round leader Dustin Johnson joins him, together with Englishman Brian Davis who had success on the front nine, hitting three birdies.
Johnson, who finished on five-under to take the lead after the opening day, followed that up with an even-par 70 to join the cluster on five-under for the tournament.
The American, playing in the event for the first time in six years, felt his putting betrayed him on the day.
"Just didn't hole the putts - got a couple of bad kicks," he said. "Other than that, I played pretty solid again today."