Rory McIlroy, of Northern Ireland, smiles as he walks down the 15th fairway during a practice round for the PGA Championship golf tournament at Oak Hill Country Club, Wednesday, Aug. 7, 2013, in Pittsford, N.Y. (AP Photo/Julio Cortez)
US President Barack Obama delivers a keynote address ahead of the G-8 summit at Waterfront Hall in Belfast, Northern Ireland on Monday, June 17, 2013. (AP Photo/ Paul Faith, Pool)
Rory McIlroy of Northern Ireland reacts after playing a shot off the 6th tee during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Scott Heppell)
Rory McIlroy of Northern Ireland plays a shot onto the first green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison)
Rory McIlroy of Northern Ireland looks down the first fairway during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison)
Rory McIlroy of Northern Ireland plays a shot onto the first green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison)
Rory McIlroy of Northern Ireland lines up a putt on the third green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison)
Rory McIlroy of Northern Ireland reacts after missing a putt on the second green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison)
Rory McIlroy of Northern Ireland plays a shot on the 7th hole during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison)
Rory McIlroy of Northern Ireland reacts after playing a shot off the 6th tee during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Scott Heppell)