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MELBOURNE, AUSTRALIA - JANUARY 20: Maria Sharapova of Russia plays a forehand in her third round match against Angelique Kerber of Germany on day six of the 2018 Australian Open at Melbourne Park on January 20, 2018 in Melbourne, Australia. (Photo by XIN LI/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 20:  Maria Sharapova of Russia plays a forehand in her third round match against Angelique Kerber of Germany on day six of the 2018 Australian Open at Melbourne Park on January 20, 2018 in Melbourne, Australia.  (Photo by XIN LI/Getty Images)