Rory McIlroy shot a bogey-free 66 (−6) in the final round to win his second major title by eight strokes over runner-up David Lynn.

The PGA of America reserves the right to invite additional players not included in the categories listed above Alternates (per category 11):[7] Nine players appeared in their first major: Matt Dobyns, Michael Frye, William McGirt, Bill Murchison III, Rod Perry, Corey Prugh, Paul Scaletta, Doug Wade and Bernd Wiesberger.

Scoring was the toughest on record since the championship assumed a strokeplay format in 1958, with the average round being over 78; 72 players made the cut which fell at 150 (+6).

Until the delay, scoring had been a little easier: world number 3 Rory McIlroy surged early with five birdies in his opening eight holes, and a remarkable par save on the third after his drive lodged in a tree.

However, a bogey on nine, his final hole of the day, dropped him back into a share of the lead with two-time champion Singh, 26 years McIlroy's senior and attempting to become the oldest major winner in history.

The overnight clubhouse lead was held by Bo Van Pelt, who carded a five-under 67 early to move to three-under for the week.

[12] The leaderboard when play was halted on Saturday at 4:50 pm EDT: Play resumed Sunday at 7:45 am EDT Sunday, August 12, 2012 Ian Poulter made an early charge by making five birdies in a row to start his round, but his charge fizzled on the back nine and he finished with four bogeys in the last six holes.

The previous PGA record winning margin was seven strokes, by Jack Nicklaus at age forty in 1980, his 17th major.