Novak Djokovic of Serbia wipes the sweat from his face during his first round match against Lukas Lacko of Slovakia at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Novak Djokovic of Serbia wipes the sweat from his face during his first round match against Lukas Lacko of Slovakia at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

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