Maria Sakkari is fond of Iga Swiatek, but the fourth-seeded Greek player showed no mercy to her fifth-seeded Polish opponent Thursday until after their first-round match at the WTA Finals at Guadalajara, Mexico. Sakkari rolled to a 6-2, 6-4 victory in 87 minutes to open Group A. The group's second match was even more one-sided, with No. 7 Paula Badosa of Spain routing No. 1 Aryna Sabalenka of Belarus 6-4, 6-0 in 77 minu