Serena Williams competed in the inaugural Mubadala World Tennis Championship women's match last year against Jelena Ostapenko. Getty Images
Serena Williams competed in the inaugural Mubadala World Tennis Championship women's match last year against Jelena Ostapenko. Getty Images
Serena Williams confirmed to play Venus at Mubadala World Tennis Championship
American superstar added to tournament line-up that also includes the world's top two male players
