Serbia's Novak Djokovic celebrates his win over Tomas Berdych of the Czech Republic in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Dita Alangkara)

Associated Press
Serbia's Novak Djokovic  celebrates his win over Tomas Berdych of the Czech Republic in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Dita Alangkara)
Serbia's Novak Djokovic celebrates his win over Tomas Berdych of the Czech Republic in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Dita Alangkara)
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