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Tiger Woods of the United States hits a shot on the first fairway during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Andrew Redington/Getty Images) ( 166415674 )

Skier Lindsey Vonn and her physical therapist Lindsay Winninger, left, watch as Tiger Woods tees off on the fourth hole during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/David Goldman) ( Masters Golf )

Tiger Woods of the United States watches a shot on the first hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Andrew Redington/Getty Images) ( 166415670 )

Hunter Mahan hits out of the rough off the first fairway during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/Darron Cummings) ( Masters Golf )

Vijay Singh of Fiji plays from a bunker on the third hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Harry How/Getty Images) ( 166408154 )

Golfers walk past an umbrella during a light rain storm during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/David J. Phillip) ( Masters Golf )

Golfer Dustin Johnson's girlfriend Paulina Gretzky (C) and agent David Winkle (L) follow him on the third hole during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Brian Snyder ( GOLF-MASTERS/ )

Amateur Michael Weaver looks around a tree before taking his shot in the rough off of the first fairway during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/Darron Cummings) ( Masters Golf )

Freddie Jacobson of Sweden hits a tee shot on the second hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Andrew Redington/Getty Images) ( 166408151 )

Alicia Fernandez-Castano looks on during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Andrew Redington/Getty Images) ( 166403460 )

Skier Lindsey Vonn and her physical therapist Lindsay Winninger walk through the Augusta National golf course with her leg brace while following Tiger Woods during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/David J. Phillip) ( Masters Golf )

Phil Mickelson of the US plays during the second round of the 77th Masters golf tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. JIM WATSON/AFP/Getty Images ( 518848846 )

From left, Angel Cabrera, of Argentina, Sergio Garcia, of Spain, and Adam Scott, of Australia, wait to tee off in the rain on the fourth hole during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/Charlie Riedel) ( Masters Golf )

Patrons make their way down the second fairway during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Mark Blinch ( GOLF-MASTERS/ )

Phil Mickelson hits off the first fairway during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/David J. Phillip) ( Masters Golf )

Tennis player Caroline Wozniacki follows Rory McIlroy, of Northern Ireland, during his second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/Darron Cummings) ( Masters Golf )

A golf fan takes cover in the rain during the second round of the 77th Masters golf tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. JEWEL SAMAD/AFP/Getty Images ( 518848717 )

Amateur Guan Tianlang of China lines up a putt on the first green during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Phil Noble ( GOLF-MASTERS/ )

Craig Stadler of the United States stands on the second green during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Harry How/Getty Images) ( 166403288 )

Francesco Molinari of Italy hits a shot on the first hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Andrew Redington/Getty Images) ( 166408280 )

Sergio Garcia of Spain plays during the second round of the 77th Masters golf tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. JEWEL SAMAD/AFP/Getty Images ( 518848720 )

Paulina Gretzky walks the course during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Mike Ehrmann/Getty Images) ( 166411233 )

Amateur Guan Tianlang of China hits his tee shot on the second hole during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Mark Blinch ( GOLF-MASTERS/ )

Vijay Singh of Fiji reacts after a birdie putt on the second hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Harry How/Getty Images) ( 166406329 )

Phil Mickelson of the US plays during the second round of the 77th Masters golf tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. JIM WATSON/AFP/Getty Images ( 518848834 )

Charl Schwartzel, of South Africa, reacts after his tee shot on the fourth hole during the second round of the Masters golf tournament Friday, April 12, 2013, in Augusta, Ga. (AP Photo/David Goldman) ( Masters Golf )

Phil Mickelson of the U.S. opens up an umbrella as he waits to hit his approach shot to the first green during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Phil Noble ( GOLF-MASTERS )

Fred Couples of the U.S. stretches before hitting his tee shot on the second hole during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Mark Blinch ( GOLF-MASTERS/ )

Patrons protect themselves from the rain near the third green during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Brian Snyder ( GOLF-MASTERS )

Dustin Johnson of the U.S. hits his tee shot on the fourth hole during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Brian Snyder ( GOLF-MASTERS )

Caroline Wozniacki watches play during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Mike Ehrmann/Getty Images) ( 166418117 )

Rory McIlroy of Northern Ireland hits his tee shot on the second hole during second round play in the 2013 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia, April 12, 2013. REUTERS/Mark Blinch ( GOLF-MASTERS/ )

Dustin Johnson of the United States tees off on the eighth hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Mike Ehrmann/Getty Images) ( 166413637 )

Tianlang Guan of China shakes with Matteo Manassero of Italy after the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Mike Ehrmann/Getty Images) ( 166418094 )

Rory McIlroy of Northern Ireland hits a shot on the 10th hole during the second round of the 2013 Masters Tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. (Photo by Mike Ehrmann/Getty Images) ( 166418154 )

Justin Rose of England plays during the second round of the 77th Masters golf tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. JIM WATSON/AFP/Getty Images ( 518851358 )

Tianlang Guan of China walks to the 18th green during the second round of the 77th Masters golf tournament at Augusta National Golf Club on April 12, 2013 in Augusta, Georgia. DON EMMERT/AFP/Getty Images ( 518852251 )