Abu Dhabi Tennis
Jelena Ostapenko, of Latvia, returns the ball to Serena Williams, of the U.S., during the final day of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates, Saturday, Dec. 30, 2017. (AP Photo/Kamran Jebreili)
Jelena Ostapenko, of Latvia, returns the ball to Serena Williams, of the U.S., during the final day of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates, Saturday, Dec. 30, 2017. (AP Photo/Kamran Jebreili)