Sofia - Ana Ivanovic overcame Sam Stosur 6-2, 5-7, 6-2 on Thursday for her second straight victory in the group stage at the season-ending WTA Tournament of Champions.
In Thursday's last match, top-seeded Simona Halep of Romania swept past Ukraine's Elina Svitolina 6-1, 6-1, to finish the round-robin phase unbeaten. She had already qualified for Saturday's semi-finals.
Results from third day of WTA Tournament of Champions tournament in Sofia on Thursday (x denotes seeding):
Ana Ivanovic (SRB x2) bt Samantha Stosur (AUS x4) 6-2, 5-7, 6-2
Elena Vesnina (RUS x5) bt Tsvetana Pironkova (BUL x8) 6-2, 4-6, 6-0
Simona Halep (ROM x1) bt Elina Svitolina (UKR) 6-1, 6-1