Lukas Lacko of Slovakia makes a forehand return to Novak Djokovic of Serbia 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

Lukas Lacko of Slovakia makes a forehand return to Novak Djokovic of Serbia 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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