Novak Djokovic of Serbia serves to Lukas Lacko of Slovakia during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Novak Djokovic of Serbia serves to Lukas Lacko of Slovakia during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

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