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Tiger Woods (R) of the U.S. speaks with playing partner Rory McIlroy of Northern Ireland as they walk on the 15th hole during the second round of the 2013 U.S. Open golf championship at the Merion Golf Club in Ardmore, Pennsylvania (Credit: Reuters/Adam Hunger)

Tiger Woods (R) of the U.S. speaks with playing partner Rory McIlroy of Northern Ireland as they walk on the 15th hole during the second round of the 2013 U.S. Open golf championship at the Merion Golf Club in Ardmore, Pennsylvania (Credit: Reuters/Adam Hunger)