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MELBOURNE, AUSTRALIA - JANUARY 26: Serena Williams of the United States plays a forehand in her quarter final match against Maria Sharapova of Russia during day nine of the 2016 Australian Open at Melbourne Park on January 26, 2016 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Serena Williams of the United States plays a forehand in her quarter final match against Maria Sharapova of Russia during day nine of the 2016 Australian Open at Melbourne Park on January 26, 2016 in Melbourne, Australia.  (Photo by Quinn Rooney/Getty Images)