Serbia's Novak Djokovic reacts during his quarterfinal match against Tomas Berdych of 

Serbia's Novak Djokovic reacts during his quarterfinal match against Tomas Berdych of the Czech Republic at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Rob Griffith)
Associated Press
Serbia's Novak Djokovic reacts during his quarterfinal match against Tomas Berdych of the Czech Republic at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Rob Griffith)
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