Muguruza, Kvitova into Tour final semis

Garbine Muguruza reached the semi-finals 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 3-0 and only needed to win a set against Kvitova to earn a semi-final berth.

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

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 won the other group, with Muguruza facing Agnieszka Radwanska in the other semi-final.

In a match that featured 15 breaks of serve, Muguruza converted her fourth match point with a backhand volley to win in 2 hours, 33 minutes.

The Spaniard is also into the doubles semis with countrywoman Carla Suarez Navarro, and said the heavy workload is taking a toll.

"For sure I'm tired today," Muguruza said.

"It's going to a challenge for me to see how much my body can handle, because now I don't have a day off. It's great to be in my position I think now, to be playing singles and doubles semifinals."