Aryna Sabalenka secures victory over Karolina Muchova at WTA Finals

Aryna Sabalenka began her quest for a first WTA Finals title with a tough win over Karolina Muchova, 7-6(2), 7-5, at the tournament in California. Despite struggling with her serve, landing only 59% of her first serves and recording seven double faults, Sabalenka managed to fight back from a break down in both sets. Muchova, who held a favorable head-to-head record against Sabalenka, could not convert her early breaks into a set win. The victory allows Sabalenka to advance, and she will face Mirra Andreeva next, who won convincingly against Elina Svitolina.

• 7:29 AMYahoo Sports — Aryna Sabalenka makes winning start in bid for first WTA Finals title despite misifiring serve