Scotland's Russell Knox and American Andrew Putnam, both seeking a first US PGA Tour title, shared the halfway lead at the US PGA Tour's Shriners Hospitals Open in Las Vegas.
Putnam, making the fourth PGA Tour start of his career, had seven birdies and one bogey in his six-under-par 65, while Knox had six birdies and two bogeys in his 67.
They shared the lead in the second event of the US tour's 2014-15 season on 10 under to be one shot in front of Americans Andrew Svoboda and Tony Finau.
Finau climbed up the leaderboard with a 65, while Svoboda posted a 67.
Putnam, who earned his PGA Tour card for this season via the Web.com developmental tour, has made the cut on the elite circuit for the first time.
Knox, meanwhile, heads into the weekend trying to improve on his career-best finish on the tour -- his playoff loss at the Honda Classic last March.
"I was all over the map," said Knox, who opened with a birdie at the first, then bogeyed the second and third. "I didn't feel real good with my swing, and I knew if I just made some pars, eventually something would click.
Spencer Levin and George McNeill shared the low round of the day with blistering eight-under-par 63s.
They were among a group sharing fifth place on eight under along with Webb Simpson (65), Ben Martin (66), Bo Van Pelt (68), Scott Piercy (67), Wes Roach (67) and Scotland's Martin Laird (70).
Laird had shared the first-round lead with former British Open champion Stewart Cink, who stumbled to a four-over 75 at TPC Summerlin to fall into a tie for 45th.
Cameron Percy is the best-placed Australian at six under and is one shot clear of compatriot Jarrod Lyle.
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