Urzula Radwanska will watch Aga and Caro (sitting back to back) face off.

The TEB BNP Paribas WTA Championships Istanbul kicks off play on Tuesday with a 5 p.m. start, featuring a Red Group matches between Petra Kvitova and Vera Zvonareva and Caroline Wozniacki and Agnieszka Radwanska, followed by a White Group match between Maria Sharapova and Samantha Stosur.

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