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

Australian Open Tennis

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

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