Rose was in the scoring area a half-mile from the grandstands behind the 18th green where the fans began to chant, "Let's go Phil!" as Mickelson paced off a last-ditch effort to force a playoff. It was a long shot - the 18th hole didn't yield a single birdie all weekend. From about 40 yards away, Mickelson's chip for birdie raced by the cup, securing Rose's victory.
Mickelson, already in the U.S. Open record book with five second-place finishes, added another that will hurt as much any of them.
Sunday was his 43rd birthday. It was the first time he was equipped with the outright lead going into the last day. His week began with a cross-country trip home to San Diego to watch his oldest daughter graduate from the eighth grade, returning just three hours before his tee time on Thursday. This was the same daughter born the day after his first runner-up finish in 1999.
All the stars were aligned. None of the putts fell in.
What hurt Mickelson even more was a wedge from about 121 yards on the 15th hole. It should have given him a good look at birdie, but it came up so short that Mickelson's best chance was to use one of his five wedges to chip from the front of the green. He hit that one too far, 25 feet by the hole, and the bogey wound up costing him a chance at the major he covets.
Mickelson ended up with a bogey on the 18th for a 74 and tied for second with Jason Day, who closed with a 71.
"Heartbreak," Mickelson said. "This is tough to swallow after coming so close. This was my best chance of all of them. I had a golf course I really liked. I felt this was as good an opportunity as you could ask for. It really hurts."
The back nine was a four-way battle, which included Hunter Mahan. He was one shot out of the lead until he three-putted the 15th hole for a double bogey, and then closed with back-to-back bogeys. Mahan had a 75 and tied for fourth with Billy Horschel (74), Ernie Els (69) and Jason Dufner, who had a 67.
Rose finished at 1-over 281, eight shots higher than David Graham's winning score in 1981 when the Open was last held at Merion. The shortest course for a major championship in nearly a decade held up just fine. It was the third time in the past four years that no one broke par in the toughest test of golf.
The last Englishman to win the Open was Tony Jacklin at Hazeltine in 1970, though Rose added to recent dominance of the Union Jack at the Open as the third winner in four years. The others were Graeme McDowell (2010) and Rory McIlroy (2011) of Northern Ireland.
New Zealand's Steve Alker finished in a share of 45th after a 2-over 72 to finish at 15-over par.
- AP
As it happened