Novak Djokovic, right, of Serbia is congratulated by Lukas Lacko of Slovakia after winning their 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, right, of Serbia is congratulated by Lukas Lacko of Slovakia after winning 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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