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Northern Ireland's Rory McIlroy reacts after a bad tee shot from the third during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . PETER MUHLY/AFP/Getty Images ( 521466814 )

Phil Mickelson of the U.S. lines up his putt on the second green during the second round of the British Open golf championship at Muirfield in Scotland July 19, 2013. REUTERS/Brian Snyder ( GOLF-OPEN/ )

A marshal holds up the "Quiet" sign during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . GLYN KIRK/AFP/Getty Images ( 521464761 )

A spectator sits in the sun during the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Matt Dunham) ( British Open Golf )

US golfer Tiger Woods lines up his putt on the fifth green during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . ADRIAN DENNIS/AFP/Getty Images ( 521462069 )

Skier Lindsey Vonn leaves the 18th hole after watching her boyfriend, Tiger Woods of the U.S., during the second round of the British Open golf Championship at Muirfield in Scotland July 19, 2013. REUTERS/Toby Melville ( GOLF-OPEN/ )

Tom Watson of the United States tees off on the 3rd hole during the second round of the 142nd Open Championship at Muirfield on July 19, 2013 in Gullane, Scotland. (Photo by Andrew Redington/Getty Images) ( 174012096 )

Spectators wearing colorful hats watch the play on the 14th hole during the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Scott Heppell) ( British Open Golf )

Jordan Spieth of the United States prepares to play a shot on the 18th hole during the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Jon Super) ( British Open Golf )

Spectators watch Tiger Woods of the United States and Graeme McDowell of Northern Ireland on the 11th hole from a grandstand during the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Scott Heppell) ( British Open Golf )

Rickie Fowler of the United States tees off on the 5th hole during the second round of the 142nd Open Championship at Muirfield on July 19, 2013 in Gullane, Scotland. (Photo by Stuart Franklin/Getty Images) ( 173999791 )

Tiger Woods of the United States looks on during the second round of the 142nd Open Championship at Muirfield on July 19, 2013 in Gullane, Scotland. (Photo by Andy Lyons/Getty Images) ( 174001731 )

Scorers update the leader board in the media centre during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013. PAUL ELLIS/AFP/Getty Images ( 521464812 )

D A Points of the United States hits his second shot on the 6th hole during the second round of the 142nd Open Championship at Muirfield on July 19, 2013 in Gullane, Scotland. (Photo by Rob Carr/Getty Images) ( 174003583 )

Vijay Singh of Fiji tees off on the 17th hole during the second round of the 142nd Open Championship at Muirfield on July 19, 2013 in Gullane, Scotland. (Photo by Matthew Lewis/Getty Images) ( 174003833 )

Ian Poulter of England reacts from the second green during the second round of the 142nd Open Championship at Muirfield on July 19, 2013 in Gullane, Scotland. (Photo by Andrew Redington/Getty Images) ( 174009667 )

Henrik Stenson of Sweden chips out of a bunker onto the fifth green during the second round of the British Open golf Championship at Muirfield in Scotland July 19, 2013. REUTERS/Brian Snyder ( GOLF-OPEN/ )

Spectators wearing colourful trousers watch the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Jon Super) ( British Open Golf )

Tiger Woods of the United States plays a shot off the 10th tee during the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Scott Heppell) ( British Open Golf )

US golfer Tiger Woods tees off on the 14th during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . ADRIAN DENNIS/AFP/Getty Images ( 521463073 )

US golfer Tiger Woods lines up a putt on the 16th green during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . ADRIAN DENNIS/AFP/Getty Images ( 521465208 )

Spain's Miguel Angel Jimenez chips onto fourth green during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . GLYN KIRK/AFP/Getty Images ( 521465272 )

US golfer Phil Mickelson plays a shot out of a bunker on the second fairway during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . PETER MUHLY/AFP/Getty Images ( 521466599 )

Northern Ireland's Rory McIlroy plays the third tee during the second round of the 2013 British Open Golf Championship at Muirfield golf course at Gullane in Scotland on July 19, 2013 . PETER MUHLY/AFP/Getty Images ( 521466763 )

Tiger Woods of the United States walks onto the 18th green during the second round of the British Open Golf Championship at Muirfield, Scotland, Friday July 19, 2013. (AP Photo/Scott Heppell) ( British Open Golf )