French Open champion Jelena Ostapenko will be Serena Williams' first opponent when the American superstar makes her long-awaited return to tennis at the Mubadala World Tennis Championship in Abu Dhabi on Saturday. Valda Kalnina / EPA
French Open champion Jelena Ostapenko will be Serena Williams' first opponent when the American superstar makes her long-awaited return to tennis at the Mubadala World Tennis Championship in Abu DhabiShow more