Novak Djokovic of Serbia makes a forehand return 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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Novak Djokovic of Serbia makes a forehand return 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)
