Simona Halep, Samantha Stosur win

SOFIA, Bulgaria -- Simona Halep, Samantha Stosur and Anastasia Pavlyuchenkova were straight-sets winners at the season-ending WTA Tournament of Champions on Wednesday.

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.

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