Rafael Nadal of Spain serves to Grigor Dimitrov of Bulgaria during 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 serves to Grigor Dimitrov of Bulgaria during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Aaron Favila)

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