Cibulkova, Navarro, Pennetta win in straight sets (Yahoo Sports)

Dominika Cibulkova, Carla Suarez Navarro and Flavia Pennetta were straight-sets winners at the start of the season-ending WTA Tournament of Champions on Tuesday. Second-seeded Cibulkova of Slovakia defeated eight-seeded Tsvetana Pironkova of Bulgaria 6-3, 7-6 (6) in round robin play in the Sredets group. Cibulkova said she was happy with her game because of ”the right tactics,” but added that ”everyone who is here is a good player, so I just have to keep doing the right thing to keep winning.” In the group’s other match, Spain’s Suarez Navarro overcame fourth-seeded Andrea Petkovic of Germany 6-0, 6-4. In the second, she broke twice for a 5-2 lead before Petkovic rallied for a comeback, getting to 5-4, but Suarez Navarro served out to seal the set at 6-4.