WTA Finals: Sabalenka stunned by Andreeva as Svitolina battles back vs Muchova

World No 3 Mirra Andreeva booked her place ‌in the semi-finals of the WTA Finals with a stunning 6-4 6-0 win over Aryna ‌Sabalenka on Wednesday, while Elina Svitolina battled back to beat Karolina ​Muchova and keep her hopes alive.