Petra Kvitova beats Caroline Wozniacki to make semis at WTA Championships . The Czech Republic will play the winner of Sunday's final between Maria Sharapova and Victoria Azarenka in a semifinal on Sunday. World number one Wozniacki , who called the trainer on during her match after complaining of feeling sick , is rock bottom of the group after playing all three of her round robin games . Victoria Azarenka joins Kvitova in the final four after beating China 's Li Na . Agnieszka Radwanska beats Vera Zvonareva to keep hopes of semi berth alive .
Petra Kvitova beats Caroline Wozniacki to make semis at WTA Championships . The Czech Republic will play the winner of Sunday's final between Maria Sharapova and Victoria Azarenka in a semifinal on Sunday. Victoria Azarenka joins Kvitova in the final four after beating China 's Li Na . Agnieszka Radwanska beats Vera Zvonareva to keep hopes of semi berth alive .