McQuillan broke out of his slump at the John Deere Classic, in Silvis, Illinois. He opened with 64 to tie for second place, one stroke out of the lead. He made the halfway cut comfortably with a second-round 69, then played well on the weekend with rounds of 70-64, finishing with 17-under-par 267, to tie for third place, winning $261,000. His three eagles led the field. His position on the Official World Golf Ranking jumped to #506. McQuillan continued his good play at the Viking Classic, near Jackson, Mississippi, where he scored 72-65-71-67, for 13-under-par 275, to tie for 34th place, winning $18,990. McQuillan made his third straight cut at the RBC Canadian Open, held over the Shaughnessy Golf & Country Club in Vancouver, scoring 68-73-74-70 for 5-over-par 285, tied for 31st place, and winning $33,800. McQuillan saw his streak of three straight made cuts end at the 2011 Greenbrier Classic, where his scores of 71-74 missed the 36-hole cut by four strokes. McQuillan tied for sixth place at the 2011 Reno-Tahoe Open with scores of 71-69-71-66 for a 277 total, 11-under-par, winning $97,125.