Maria Sakkari surged to win the final four games against top-seeded Aryna Sabalenka on Monday and advance to the semifinals of the WTA Finals. The fourth-seeded Greek player, making her debut in the event, beat her Belarusian opponent 7-6 (1), 6-7, 6-3 to complete the group play at Guadalajara, Mexico. Sakkari wound up 2-1 in the round-robin phase of the event while Sabalenka went 1-2. Up next for Sakkari is a semifina