Serbia's Novak Djokovic celebrates after his first round win over France's Paul-Henri Mathieu at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 14, 2013. (AP Photo/Andrew Brownbill)

Associated Press
Serbia's Novak Djokovic celebrates after his first round win over France's Paul-Henri Mathieu at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 14, 2013. (AP Photo/Andrew Brownbill)
Serbia's Novak Djokovic celebrates after his first round win over France's Paul-Henri Mathieu at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 14, 2013. (AP Photo/Andrew Brownbill)
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