Script:

Garbine Muguruza reached the semifinals of the WTA Finals by beating former champion Petra Kvitova 6-4, 4-6, 7-5 on Friday, with the Czech player also advancing after Lucie Safarova beat Angelique Kerber in straight sets.

Muguruza finished the round-robin stage with a 3-0 record and only needed to win a set against Kvitova to guarantee herself a semi-final berth.

The other three players in the group all finished 1-2, but Kvitova advanced given the fact she won more sets.

After losing to Muguruza, Kvitova needed the already eliminated Safarova to beat Kerber without dropping a set, and her compatriot came through by winning 6-4, 6-3.

Kvitova will play Maria Sharapova, who topped the other group, while Muguruza facing Agnieszka Radwanska in semi-final number two.

In a match that featured 15 breaks of serve, Muguruza converted her fourth match point with a backhand cross-court volley to win in two hours, 33 minutes.