Rafael Nadal of Spain walks off the court after defeating Grigor Dimitrov of Bulgaria in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Rafael Nadal of Spain walks off the court after defeating Grigor Dimitrov of Bulgaria in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Aaron Favila)

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