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

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