American Brendan Steele opened up a three-shot lead at the Texas Open as darkness brought an early end to the second round.
Steele completed an eight-under 64 in the first round on Friday, with his red-hot run at TPC San Antonio having been cut short a day earlier.
The 2011 champion followed it up with a two-under 70 to move into 10 under, three shots clear of Scott Langley, Charley Hoffman and Stuart Appleby.
Steele had six birdies, two bogeys and a double bogey in his second round as he extended his overnight lead.
"I definitely feel comfortable here, even other than the win I've had a couple of other good results here. It's always nice to come back to a place you feel good at," Steele said.
"That [good driving] is what it's all about out here.
"There's so much trouble down each side of every hole that if you drive it well you're going to be in pretty good shape and that's normally a good part of my game so that's something I try and lean on out here for sure."
Langley (68), Appleby (70) and Hoffman (71) were solid to be at seven under and still in contention.
Ricky Barnes (70), Patrick Reed (73), Ryan Palmer (70), Jon Curran (68) and Mark Wilson (69) are locked in a tie for fifth with Peter Malnati (71) and Kang Sung (67).
Englishman Luke Donald, searching for his first PGA Tour win since 2012, is at five under after a 70.
Most of the field got through their second rounds, with Martin Piller the best of those yet to complete 36 holes.
The American sits at five under through 15 holes in the second round.
Defending champion Jimmy Walker is set to miss the cut after backing up his 75 with a five-over 77.