WTA Finals 2015: Petra

Petra Kvitova and Agnieszka Radwanska advanced to the title match at the WTA Finals Saturday after upset victories in semifinal matches in Singapore.

Agnieszka Radwanska Defeats Petra Kvitova to Win WTA Finals

Kvitova stuns Sharapova to reach WTA Finals decider, Tennis

WTA Finals 2015: Petra

2018 Season Review: Petra Kvitova

Agnieszka Radwanska vs. Petra Kvitova, Full Match

WTA Finals: Kvitova upsets Sharapova, to face Radwanska in final

Agnieszka Radwanska claims WTA Finals crown in Singapore, Tennis News

WTA Finals: Petra Kvitova to face Agnieszka Radwanska in final - BBC Sport

WTA Finals: Garbine Muguruza, Petra Kvitova reach s-finals from White Group