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MELBOURNE, AUSTRALIA - JANUARY 19: Saisai Zheng of China plays a backhand in her first round match against Carina Witthoeft of Germany during day two of the 2016 Australian Open at Melbourne Park on January 19, 2016 in Melbourne, Australia. (Photo by Zak Kaczmarek/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 19:  Saisai Zheng of China plays a backhand in her first round match against Carina Witthoeft of Germany during day two of the 2016 Australian Open at Melbourne Park on January 19, 2016 in Melbourne, Australia.  (Photo by Zak Kaczmarek/Getty Images)