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

Australian Open Tennis

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

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