Rory McIlroy, of Northern Ireland, watches his putt on the first green during practice for the U.S. Open golf tournament at Merion Golf Club, Tuesday, June 11, 2013, in Ardmore, Pa. (AP Photo/Darron Cummings)

Photo by: Darron Cummings

Rory McIlroy, of Northern Ireland, watches his putt on the first green during practice for the U.S. Open golf tournament at Merion Golf Club, Tuesday, June 11, 2013, in Ardmore, Pa. (AP Photo/Darron Cummings)