Rafael Nadal

Rafael Nadal throws his towel to a ball boy during his semifinal against Bulgaria's Grigor Dimitrov at the Australian Open. Kin Cheung/AP hide caption

Stanislas Wawrinka of Switzerland kisses the Australian Open trophy during the awarding ceremony after winning the men's singles final against Spain's Rafael Nadal on Sunday in Melbourne, Australia. Xu Yanyan/Xinhua/Landov hide caption

Rafael Nadal of Spain celebrates after defeating Roger Federer of Switzerland during their semifinal Friday at the Australian Open tennis championship in Melbourne. Aaron Favila/AP hide caption

Rafael Nadal of Spain reacts after a point against Novak Djokovic of Serbia during the men's singles final of the 2013 U.S. Open tennis tournament Monday in New York. Charles Krupa/AP hide caption

Steve Darcis of Belgium, left, shakes hands with Rafael Nadal of Spain Monday, after winning their first-round match at the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club. Mike Hewitt/Getty Images hide caption

Spain's Rafael Nadal looks on during his Wimbledon loss to Czech Republic's Lukas Rosol in June. Miguel Medina/AFP/Getty Images hide caption

Rafael Nadal of Spain celebrates winning the French Open earlier today. Bernat Armangue/AP hide caption