Serena Williams leads Red Group
Top-ranked titleholder Serena Williams will face former winner Petra Kvitova in her group at the WTA Championships, which start Tuesday in Istanbul.
Sunday's draw for the event that brings together the top eight players in the world also put Agnieszka Radwanska and Angelique Kerber in Williams' Red Group.
Second-ranked Victoria Azarenka heads the White Group, which also includes Li Na, Sara Errani and Jelena Jankovic. Third-ranked Maria Sharapova pulled out of the event because of ...
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