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MELBOURNE, AUSTRALIA - JANUARY 28: Serena Williams of the United States celebrates winning her semi final match against Agnieszka Radwanska of Poland during day 11 of the 2016 Australian Open at Melbourne Park on January 28, 2016 in Melbourne, Australia. (Photo by Darrian Traynor/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 28:  Serena Williams of the United States celebrates winning her semi final match against Agnieszka Radwanska of Poland during day 11 of the 2016 Australian Open at Melbourne Park on January 28, 2016 in Melbourne, Australia.  (Photo by Darrian Traynor/Getty Images)