Scottie Scheffler carded a stellar round of 63 on Friday to take a six-shot lead after the second day of The CJ Cup Byron Nelson.
The world number one got his day going with a superb eagle on the par-five ninth and added six birdies on the back nine without dropping a shot.
The flawless performance followed up the American's impressive opening-round 61 as he heads into the weekend atop the leaderboard on 18-under-par.
Speaking after his round, Scheffler told pgatour.com: "Feeling good. I've had two nice days.
"Overall, very pleased with how I played... it's great to be playing at home.
"This tournament means a lot to me, and it's nice to be playing good golf as well."
Scheffler leads by six from compatriot Sam Stevens, with fellow American Ricky Castillo a shot further back.
Ireland's Seamus Power missed the cut after a level-par 71 saw him finish on three-under par.
