TULSA, Okla. (AP) — The brilliant Northern Irishman who set the record for largest margin of victory in the PGA Championship a decade ago will need to mount his biggest comeback Sunday if he wants to win a third Wanamaker Trophy. First-round leader Rory McIlroy, whose stellar start turned into a stunning slide down the leaderboard Saturday, offset four birdies with three bogeys, a double and a triple during his wild ride around Southern Hills. By the time he missed a 15-footer for par at the 18th, leaving him with a 4-over 74, McIlroy found himself nine shots back of leader Mito Pereira.