In Istanbul, Turkey, top ranked Serena Williams advanced to the semi-finals of the WTA Champinships by sweeping Petra Kvitova 6-2, 6-3 on Thursday. Angelique Kerber upset number three Agnieszka Radwanska 6-2, 6-2 to remain in contention for the semi-finals and eliminate Radwanska. Kerber will play Kvitova Friday for a spot in the last four players.
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