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MELBOURNE, AUSTRALIA - JANUARY 21: Laura Siegemund of Germany plays a backhand in her second round match against Jelena Jankovic of Serbia during day four of the 2016 Australian Open at Melbourne Park on January 21, 2016 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 21:  Laura Siegemund of Germany plays a backhand in her second round match against Jelena Jankovic of Serbia during day four of the 2016 Australian Open at Melbourne Park on January 21, 2016 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)