Top-seeded Halep beat seventh-seeded Alize Cornet of France 6-4, 6-4, with a second consecutive round-robin win in the Serdika group to ease her way to the semifinals. The Romanian's last match of the group stage will be against Ukraine's Elina Svitolina, who replaced injured Maria Kirilenko.
Former U.S. Open champion Stosur had a 6-3, 6-3 victory over fifth-seeded Russian Elena Vesnina in the Sredets group. Vesnina took a surprise 3-0 lead in the second set before Stosur rallied take the match. In Wednesday's last match, Russia's Pavlyuchenkova topped Svitolina 6-2, 6-4.