Serbia's Novak Djokovic holds his trophy after defeating Britain's Andy Murray in the men's final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 27, 2013. (AP Photo/Aaron Favila)
Britain's Andy Murray wipes the sweat from his face during the men's final against Serbia's Novak Djokovic at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 27, 2013. (AP Photo/Aaron Favila)
Serbia's Novak Djokovic celebrates his win over Britain's Andy Murray in the men's final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 27, 2013. (AP Photo/Dita Alangkara)
Serbia's Novak Djokovic celebrates his win over Britain's Andy Murray in the men's final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 27, 2013. (AP Photo/Dita Alangkara)
Bob and Mike Bryan of the US celebrate after defeating Robin Haase and Igor Sijsling of the Netherlands in the men's doubles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 27, 2013. (AP Photo/Andrew Brownbill)
Victoria Azarenka of Belarus kisses her trophy after winning the women's final against China's Li Na at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 26, 2013. (AP Photo/Andy Wong)