French Open champion Mirra Andreeva stormed past Aryna Sabalenka 6-4, 6-0 to reach the last four of the WTA Finals on Wednesday as Elina Svitolina kept her bid on track with a three-set win over Karolina Muchova. Russian 19-year-old Andreeva held her nerve after falling behind 4-1 in the opening set — winning the last