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MELBOURNE, AUSTRALIA - JANUARY 19: Polona Hercog of Slovenia plays a backhand in her first round match against Jelena Jankovic of Serbia during day two of the 2016 Australian Open at Melbourne Park on January 19, 2016 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 19:  Polona Hercog of Slovenia plays a backhand in her first round match against Jelena Jankovic of Serbia during day two of the 2016 Australian Open at Melbourne Park on January 19, 2016 in Melbourne, Australia.  (Photo by Quinn Rooney/Getty Images)