MILAN, ITALY - SEPTEMBER 23: Serena Williams is seen leaving the Versace show during Milan Fashion Week Spring/Summer 2017 on September 23, 2016 in Milan, Italy. (Photo by Jacopo Raule/Getty Images)

MILAN, ITALY - SEPTEMBER 23:  Serena Williams is seen leaving the Versace show during Milan Fashion Week Spring/Summer 2017 on September 23, 2016 in Milan, Italy.  (Photo by Jacopo Raule/Getty Images)

LONDON, ENGLAND - JULY 10: Serena Williams attends the Wimbledon Winners Ball at The Guildhall on July 10, 2016 in London, England. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND - JULY 10:  Serena Williams attends the Wimbledon Winners Ball at The Guildhall on July 10, 2016 in London, England.  (Photo by Karwai Tang/WireImage)

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

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

BEVERLY HILLS, CA - FEBRUARY 28: Tennis player Serena Williams attends the 2016 Vanity Fair Oscar Party hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)

BEVERLY HILLS, CA - FEBRUARY 28:  Tennis player Serena Williams attends the 2016 Vanity Fair Oscar Party hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California.  (Photo by Jon Kopaloff/FilmMagic)

LONDON, ENGLAND - JULY 07: Serena Williams of The United States celebrates victory during the Ladies Singles Semi Final match against Elena Vesnina of Russia on day ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2016 in London, England. (Photo by Julian Finney/Getty Images)

LONDON, ENGLAND - JULY 07:  Serena Williams of The United States celebrates victory during the Ladies Singles Semi Final match against Elena Vesnina of Russia on day ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2016 in London, England.  (Photo by Julian Finney/Getty Images)