Australian Nick O&aposHern lost his lead at the Frys.com Open as American John Mallinger produced a sterling second round. O&aposHern produced a course record nine-under 62 to take the lead after the opening day on Thursday, but the Aussie struggled to maintain that pace as he signed off on an even-par 71 in his second round. As O&aposHern struggled to add to his score, several others took their chance to overtake him, with Mallinger producing his own equal course record 62 to take a stranglehold of proceedings at the CordeValle Golf Club on Friday. Having posted a respectable five-under in the opening round, 30-year-old Mallinger picked up three strokes on his front nine before coming home with a bang, producing a further four birdies and an eagle on his final nine holes to be bogey-free after two rounds. Mallinger is now at 14-under for the tournament, four strokes ahead of fellow American Billy Horschel and Venezuelan Jhonattan Vegas. Horschel fired seven birdies, including five on his last seven holes, to post a six-under 65 on Friday, while Vegas carded a four-under 67. O&aposHern is one of three players at nine-under for the tournament, alongside Belgian Ryder Cup hero Nicolas Colsaerts (68) and American Scott Dunlap, who produced an excellent second round of eight-under 63. Forty-one-year-old O&aposHern looked to have picked up where he left off on Thursday when he birdied the second hole, but from then on there was hardly any joy for the Australian as he posted two bogeys and a birdie on his back nine.