American Nick Watney extended his lead at the top of the leaderboard after the second round of the Barracuda Championship in Reno.
The 33-year-old hit three birdies on the front nine but two further birdies on the back nine were clouded by two bogeys in the tournament which uses the Modified Stableford format to allocate points based on the number of strokes taken at each hole.
Watney claimed eight points on day two to take his total to 26, three ahead of Australia's Geoff Ogilvy with Wes Roach a point further back in third.
Ireland's Padraig Harrington lies nine points behind Watney's lead score.
"The course was great and I played pretty well," Watney told PGA.com. "I would have liked to have made a few more putts, but overall, if you would have told me 26 points after two days, I would take it every time.
"I got to keep going. We've got a long way to go and just try to keep my head down and stay focused on where I'm at."
Ogilvy, who won the last of his seven PGA TOUR titles in 2010, claimed an eagle on the 13th hole among two birdies and two bogeys to finish the round with seven.
Ogilvy said: "It was tricky.
"The elevation makes it hard anyway, or awkward, and you add in that wind that goes from nothing to 20 miles an hour and back, gusting and spinning around down different directions, it feels like. It's really awkward out there.
"I'm hitting the ball well. Obviously, if I hole a few putts, hopefully, I'll be there at the end."
America's Roach also impressed with an eagle on the 13th in a second-round which included four birdies and three bogeys to claim 10 points to add to his opening 12.