MELBOURNE, AUSTRALIA - JANUARY 22: Agnieszka Radwanska of Poland serves in her quarter final match against Na Li of China during day nine of the 2013 Australian Open at Melbourne Park on January 22, ... more 

MELBOURNE, AUSTRALIA - JANUARY 22: Agnieszka Radwanska of Poland serves in her quarter final match against Na Li of China during day nine of the 2013 Australian Open at Melbourne Park on January 22, 2013 in Melbourne, Australia. (Photo by Cameron Spencer - Pool/Getty Images) less