Defending champion Novak Djokovic of Serbia waves as he walks onto Rod Laver Arena to play Lukas Lacko of Slovakia in their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Defending champion Novak Djokovic of Serbia waves as he walks onto Rod Laver Arena to play Lukas Lacko of Slovakia in 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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