Novak Djokovic, left, of Serbia is congratulated by Leonardo Mayer of Argentina after winning their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Novak Djokovic, left, of Serbia is congratulated by Leonardo Mayer of Argentina after winning their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)

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