Arron Oberholser carded eight birdies and two bogeys in his second-round 64 to lead the Frys.com Open by a stroke on 11-under from Steve Allan.
Oberholser enjoyed a sizzling start at Grayhawk Golf Club, sinking birdies on four of his first six holes while the 33-year-old was also perfect off the tee as he hit every fairway.
Allan began his round on the back nine but the Australian birdied five of his final seven holes on the front to finish seven-under for the day and 10-under for the tournament.
Americans Brad Elder and George McNeill both collected eight birdies and a single bogey en route to rounds of 63 to finish two shots behind Oberholser on nine-under.
Paul Goydos posted the lowest round of the day, collecting eight birdies during a bogey-free round of 62. First round co-leader John Mallinger joined Goydos, Matthew Goggin and Robert Garrigus on eight-under after shooting a 69.
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