MELBOURNE, AUSTRALIA - JANUARY 28: Serena Williams of the United States is congratulated by Venus Williams of the United States after winning the Women's Singles Final match against on day 13 of the 2017 Australian Open at Melbourne Park on January 28, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 28:  Serena Williams of the United States is congratulated by Venus Williams of the United States after winning the Women's Singles Final match against on day 13 of the 2017 Australian Open at Melbourne Park on January 28, 2017 in Melbourne, Australia.  (Photo by Scott Barbour/Getty Images)