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MELBOURNE, AUSTRALIA - JANUARY 26: Serena Williams (left) of USA and Maria Sharapova (right) of Russia are seen prior to their women's singles quarter final match in the 2016 Australian Open at Melbourne Park on January 26, 2016 in Melbourne, Australia. (Photo by Recep Sakar/Anadolu Agency/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26: Serena Williams (left) of USA and Maria Sharapova (right) of Russia are seen prior to their women's singles quarter final match in the 2016 Australian Open at Melbourne Park on January 26, 2016 in Melbourne, Australia. (Photo by Recep Sakar/Anadolu Agency/Getty Images)