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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)

2013 Australian Open

Highlights from the 2013 Australian Open tennis championship in Melbourne, Australia.