Australian Scott Gardiner is in the hunt at the Wells Fargo Championship, sitting two shots behind leader Phil Mickelson at the halfway mark. Stuart Appleby (two under) and John Senden (one under) have been solid, while Steven Bowditch (one over), Geoff Ogilvy, Robert Allenby and Matt Jones (all two over) also made the cut. Cameron Percy and Alistair Presnell will miss the weekend. American left-hander Mickelson holed six birdies and a bogey in his second round at Quail Hollow Club in Charlotte. Australian Scott Gardiner and Americans Nick Watney and George McNeill are at seven under, while Rory McIlroy who was in a seven-way share of the lead overnight dropped into a tie for fifth. Northern Irishman McIlroy carded a one-under 71, sitting alongside Englishman Lee Westwood, Australian Rod Pampling and Americans Jason Kokrak and Derek Ernst. Mickelson holed 15-foot birdie putts on his opening two holes before adding another pair of birdies on the seventh and ninth holes. He bogeyed the par-four 12th but responded with consecutive birdies on holes 14 and 15. Gardiner went through bogey-free, including holing four straight birdies from the sixth, in his five-under 67, while Watney managed four birdies and two bogeys in a two-under 70. McNeill produced a rollercoaster four-under 68, while two holes cost McIlroy in his round. McIlroy started on the back nine and bogeyed the par-five 10th and the 18th, but he put together three birdies to stay in contention. Americans Lucas Glover and Robert Garrigus are tied for 10th at five under, with Englishman David Lynn joining them. The United States&apos Rickie Fowler looks too far back to defend his title after a second straight even-par 72. German Martin Kaymer, Belgian Nicolas Colsaerts and American Bill Haas were among those who missed the cut.