Novak Djokovic of Serbia yells as he plays  Lukas Lacko of Slovakia 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

Novak Djokovic of Serbia yells as he plays Lukas Lacko of Slovakia 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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