China's Li Na celebrates after defeating Poland's Agnieszka Radwanska in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Dita Alangkara)

Associated Press
China's Li Na celebrates after defeating Poland's Agnieszka Radwanska in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Dita Alangkara)
China's Li Na celebrates after defeating Poland's Agnieszka Radwanska in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. (AP Photo/Dita Alangkara)