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Henrik Stenson, of Sweden, tees off on the fourth hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Charlie Riedel) ( US Open Golf )

Charl Schwartzel, of South Africa, reacts after missing a putt on the fifth hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Gene J. Puskar) ( US Open Golf )

Billy Horschel reacts to a missed putt on the eighth hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Gene J. Puskar) ( US Open Golf )

Hunter Mahan tees off on the ninth hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Gene J. Puskar) ( US Open Golf )

Tiger Woods reacts to a putt on the sixth hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Darron Cummings) ( US Open Golf )

Nicolas Colsaerts, of Belgium, waits to putt on the 11th hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Gene J. Puskar) ( US Open Golf )

Michael Kim hits out of a bunker on the 17th hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Julio Cortez) ( US Open Golf )

Rory McIlroy, of Northern Ireland, reacts after putting on the 15th green during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Darron Cummings) ( US Open Golf )

Tiger Woods of the United States hits his tee shot on the second hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Drew Hallowell/Getty Images) ( 170621034 )

Padraig Harrington of Ireland reacts to a missed putt for biridie on the fourth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by David Cannon/Getty Images) ( 170614081 )

Jason Dufner of the United States hits his tee shot on the second hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Drew Hallowell/Getty Images) ( 170621045 )

John Senden of Australia lines up his putt on the fifth green during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Andrew Redington/Getty Images) ( 170621845 )

Phil Mickelson (R) of the United States watches his tee shot on the fifth tee as Billy Horschel (L) of the United States looks on during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by David Cannon/Getty Images) ( 170623648 )

Henrik Stenson of Sweden reacts to a missed putt for eagle on the fourth green during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by David Cannon/Getty Images) ( 170623789 )

Phil Mickelson of the United States hits his second shot on the seventh hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Ross Kinnaird/Getty Images) ( 170624290 )

Edward Loar of the United States hits his second shot on the eighth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Rob Carr/Getty Images) ( 170624354 )

Tiger Woods of the United States reacts to a missed putt for par on the sixth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Drew Hallowell/Getty Images) ( 170624352 )

Tiger Woods of the United States hits his second shot on the 11th hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Drew Hallowell/Getty Images) ( 170624589 )

Amateur Michael Kim of the United States hits his tee shot on the fourth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Andrew Redington/Getty Images) ( 170626240 )

Rory McIlroy of Northern Ireland hits his tee shot on the 11th hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Drew Hallowell/Getty Images) ( 170624600 )

Phil Mickelson of the United States hits his tee shot on the eighth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Ross Kinnaird/Getty Images) ( 170626521 )

Henrik Stenson of Sweden reacts to his missed putt for eagle on the fourth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by David Cannon/Getty Images) ( 170626653 )

Charl Schwartzel of South Africa chips on the tenth green during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Rob Carr/Getty Images) ( 170626427 )

A general view of the ninth green is seen during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by David Cannon/Getty Images) ( 170628779 )

Charl Schwartzel of South Africa hits his tee shot on the ninth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Rob Carr/Getty Images) ( 170626712 )

Tiger Woods of the United States hits his second shot on the sixth hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Drew Hallowell/Getty Images) ( 170626676 )

Anthony Medori, of Wilmington, Del., poses for a photo during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Gene J. Puskar) ( US Open Golf )

Billy Horschel of the United States putts during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by David Cannon/Getty Images) ( 170628968 )

Charley Hoffman of United States walks out of a creek after having to stand in it to chip to the 4th green during the third round of the US Open at Merion Golf Club June 15, 2013 in Ardmore, Pennsylvania. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 520608227 )

England's Justin Rose watches his tee shot on the second hole during the third round of the 2013 U.S. Open golf championship at the Merion Golf Club in Ardmore, Pennsylvania, June 15, 2013. REUTERS/Adam Hunger ( GOLF-OPEN/ )

Ian Poulter of England gestures during the third round of the US Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 520605155 )

Paul Casey, right, of England, and Scott Langley walk to the first green during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Morry Gash) ( US Open Golf )

Scott Langley reacts after putting on the first hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Morry Gash) ( US Open Golf )

Paul Casey, of England, reacts after missing a putt on the first hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Morry Gash) ( US Open Golf )

Cheng-Tsung Pan, of Taiwan, lines up a putt on the first green during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Morry Gash) ( US Open Golf )

Marcel Siem, of Germany, stretches before teeing off on the first hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Darron Cummings) ( US Open Golf )

K.J. Choi, of South Korea, tees off on the fourth hole during the third round of the U.S. Open golf tournament at Merion Golf Club, Saturday, June 15, 2013, in Ardmore, Pa. (AP Photo/Charlie Riedel) ( US Open Golf )

Amateur Cheng-Tsung Pan of Chinese Taipei hits his second shot on the tenth hole during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Andrew Redington/Getty Images) ( 170603070 )

Charley Hoffman of the United States watches his second shot on the eigth hole during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Andrew Redington/Getty Images) ( 170602921 )

Jerry Kelly of the United States hits his tee shot on the eighth hole during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Andrew Redington/Getty Images) ( 170603027 )

Luke Donald of England lines up a putt on the 15th green during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Ross Kinnaird/Getty Images) ( 170603180 )

A detailed shot of Luke Donald of England is seen while he waits on the 15th green during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Ross Kinnaird/Getty Images) ( 170603184 )

Hiroyuki Fujita of Japan hits an approach shot on the 18th hole during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Scott Halleran/Getty Images) ( 170603490 )

Jason Dufner of the United States hits his tee shot on the 18th hole during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Ross Kinnaird/Getty Images) ( 170603217 )

Lee Westwood of England looks on after hitting his tee shot on the 11th hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Rob Carr/Getty Images) ( 170609628 )

Paul Lawrie of Scotland looks on after hitting his tee shot on the 11th hole during Round Three of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Rob Carr/Getty Images) ( 170609647 )

Mackenzie Hughes of Canada hits his second shot on the tenth hole during the continuation of Round Two of the 113th U.S. Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. (Photo by Andrew Redington/Getty Images) ( 170607606 )

Cheng-Tsung Pan of Taiwan watches his shot from the 16th tee during a continuation of the second round of the US Open at Merion Golf Club on June 15, 2013 in Ardmore, Pennsylvania. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 520596773 )

Amateur Cheng-Tsung Pan of Taiwan chips to the 15th green during completion of the second round of the 2013 U.S. Open golf championship at the Merion Golf Club in Ardmore, Pennsylvania, June 15, 2013. REUTERS/Matt Sullivan ( GOLF-OPEN/ )

Amateur Cheng-Tsung Pan of Taiway hits from the 14th fairway during completion of the second round of the 2013 U.S. Open golf championship at the Merion Golf Club in Ardmore, Pennsylvania, June 15, 2013. REUTERS/Matt Sullivan ( GOLF-OPEN/ )