Aryna Sabalenka makes winning start in bid for first WTA Finals title despite misifiring serve

Aryna Sabalenka began her WTA Finals campaign with a winning performance despite struggling with her serve during the match. The Belarusian, who is the tournament favourite, previously won a WTA 1000 event at the same venue in March. Sabalenka is seeking her first WTA Finals title at the event.