Rafael Nadal of Spain falls as he plays Kei Nishikori of Japan during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Rafael Nadal of Spain falls as he plays Kei Nishikori of Japan during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)

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