Zach Johnson of the United States plays 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)
Thomas Bjorn of Denmark walks along the 8th fairway 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)
Camilo Villegas of Colombia, left, and Angel Cabrera of Argentina look down the 6th fairway 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 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)
Miguel Angel Jimenez of Spain smokes a cigar on the driving range ahead of the British Open Golf Championship at Muirfield, Scotland, Wednesday July 17, 2013. (AP Photo/Jon Super)
David Duval of the United States plays a shot off the third tee during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Matt Dunham)
Tom Watson of the US gestures as he walks off the third tee box during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Matt Dunham)
Bubba Watson of the United States holds his ball after putting on the 9th green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Jon Super)
Justin Rose of England reacts on the second green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Jon Super)
Ian Poulter of England prepares to play 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)
Dustin Johnson of the United States plays 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)
Tom Watson of the United States watches his 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)
Phil Mickelson of the United States prepares to play off the 6th tee with his caddie Jim Mackay during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Scott Heppell)
Phil Mickelson of the United States plays a shot off the third tee 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)