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MELBOURNE, AUSTRALIA - JANUARY 30: Angelique Kerber of Germany plays a forehand in her Women's Singles Final match against Serena Williams of the United States during day 13 of the 2016 Australian Open at Melbourne Park on January 30, 2016 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 30:  Angelique Kerber of Germany plays a forehand in her Women's Singles Final match against Serena Williams of the United States during day 13 of the 2016 Australian Open at Melbourne Park on January 30, 2016 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)