Serbia's Novak Djokovic clenches his fist after scoring against Spain's Rafael Nadal in their semifinal match at the French Open tennis tournament, at Roland Garros stadium in Paris, Friday June 7, 2013. (AP Photo/Michel Euler)

Photo by: Michel Euler

Serbia's Novak Djokovic clenches his fist after scoring against Spain's Rafael Nadal in their semifinal match at the French Open tennis tournament, at Roland Garros stadium in Paris, Friday June 7, 2013. (AP Photo/Michel Euler)