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ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30 : Serena Williams of United States in action during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Mahmoud Khaled/Anadolu Agency/Getty Images)

ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30 :  Serena Williams of United States in action during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates.  (Photo by  Mahmoud Khaled/Anadolu Agency/Getty Images)