Azarenka saves match points, Sharapova through to semis
Serena Williams beat 2011 French Open champion Li Na of China
7-6,6-3 for her second win in round-robin matches to close in on
the semifinals at the tournament for the top eight players in the world. top-ranked Victoria Azarenka saved two match points before rallying past Angelique Kerber of Germany 6-7 (11), 7-6 (2), 6-4 in her first match at the event. Maria Sharapova also made into the semi finals with a tough three sets victory over Agnieszka Radwanska of Poland 5-7,7-5,7-5.