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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) ( British Open Golf )

Phil Mickelson of the United States tees off during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Stuart Franklin/Getty Images) ( 173830881 )

A spectator watches the play through binoculars during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Scott Heppell) ( British Open Golf )

R&A and The Open Championship flags wave during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Matthew Lewis/Getty Images) ( 173856281 )

Northern Ireland's Rory McIlroy stands on the fourth tee during the first round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 18, 2013 . GLYN KIRK/AFP/Getty Images ( 521433453 )

Tiger Woods of the U.S.(R) speaks with his caddie Joe Lacava as he waits to tee off on the second hole during the first round of the British Open golf championship at Muirfield in Scotland July 18, 2013. REUTERS/Brian Snyder ( GOLF-OPEN/ )

Phil Mickelson of the United States plays out of a bunker on the 17th hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Stuart Franklin/Getty Images) ( 173830847 )

Tiger Woods of the United States drops his ball on the 1st hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Andrew Redington/Getty Images) ( 173855550 )

Tiger Woods of the United States prepares to hit out of the rough on the 1st hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Andrew Redington/Getty Images) ( 173855597 )

Rory McIlroy of Northern Ireland plays out of the rough on the 18th hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Stuart Franklin/Getty Images) ( 173830819 )

A club cover on the Ping bag of Bubba Watson of the United States is seen during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Andrew Redington/Getty Images) ( 173797033 )

Miguel Angel Jimenez of Spain plays a shot off the 14th tee during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Matt Dunham) ( British Open Golf )

US golfer Tom Watson tees off on the second during the first round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 18, 2013 . ADRIAN DENNIS/AFP/Getty Images ( 521431936 )

US golfer Tom Watson watches his drive from the fourth tee during the first round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 18, 2013 . GLYN KIRK/AFP/Getty Images ( 521430668 )

Tiger Woods of the U.S. plays a shot on the second hole during the first round of the British Open golf championship at Muirfield in Scotland July 18, 2013. REUTERS/Brian Snyder ( GOLF-OPEN/ )

Rory McIlroy of Northern Ireland tees off on the 4th hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Matthew Lewis/Getty Images) ( 173805916 )

Rory McIlroy of Northern Ireland hits out of a bunker on the 5th hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Matthew Lewis/Getty Images) ( 173806080 )

Ian Poulter of England reacts to a missed birdie putt on the 2nd hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Rob Carr/Getty Images) ( 173810713 )

Miguel Angel Jimenez of Spain plays out of a sand trap on the 18th hole during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Matt Dunham) ( APTOPIX British Open Golf )

Zach Johnson of the United States looks at his ball on the 13th green during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison) ( British Open Golf )

Rafael Cabrera-Bello of Spain plays out of the rough on the 18th hole during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Matt Dunham) ( British Open Golf )

Amateur golfer, England's Matthew Fitzpatrick, tees off on the third during the first round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 18, 2013 . PETER MUHLY/AFP/Getty Images ( 521437316 )

David Lynn of England hits his second shot on the 11th hole during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Andy Lyons/Getty Images) ( 173825866 )

Zach Johnson of the U.S. watches his tee shot on the tenth hole during the first round of the British Open golf Championship at Muirfield in Scotland July 18, 2013. REUTERS/Toby Melville ( GOLF-OPEN/ )

Zach Johnson of the U.S. watches his second shot on the tenth hole during the first round of the British Open golf Championship at Muirfield in Scotland July 18, 2013. REUTERS/Toby Melville ( GOLF-OPEN/ )

Tiger Woods of the U.S. waits to putt on the fourth green during the first round of the British Open golf championship at Muirfield in Scotland July 18, 2013. REUTERS/Brian Snyder ( GOLF-OPEN/ )

Phil Mickelson of the United States, left, and Rory McIlroy of Northern Ireland shake hands on the first hole during the first round of the British Open Golf Championship at Muirfield, Scotland, Thursday July 18, 2013. (AP Photo/Peter Morrison) ( British Open Golf )

US golfer Brandt Snedeker watches his drive from the fourth tee during the first round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 18, 2013 . PETER MUHLY/AFP/Getty Images ( 521434010 )