CANCUN, Mexico — No.4 Elena Rybakina kept her chances alive of advancing out of the Bacalar Group after defeating No.9 Maria Sakkari 6-0, 6-7 (4), 7-6 (2) at the GNP Seguros WTA Finals Cancun. With a 1-1 record, Rybakina’s victory moved her into a tie with No.1 Aryna Sabalenka for second place in the group.