Rafael Nadal of Spain makes a backhand return to Thanasi Kokkinakis of Australia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Rafael Nadal of Spain makes a backhand return to Thanasi Kokkinakis of Australia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Aaron Favila)

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