Petra Kvitova leads the seeds through in Prague

Second seed Petra Kvitova had no problems booking her place in the quarter-finals of the Prague Open.

The two-time Grand Slam winner easily beat Russian Natalia Vikhlyantseva 6-3, 6-1 in 56 minutes to set up a last-eight encounter against fellow Czech Katerina Siniakova.

The eighth-seeded Siniakova overcame Russian in Ekaterina Alexandrova 6-4, 3-6, 6-3.

Sixth seed Zhang Shuai also advanced as she beat Elena-Gabriela Ruse from Romania 6-4, 6-4 to set up a clash with Jasmine Paolini from Italy.

Meanwhile, veteran Sam Stosur was too good for Denisa Allertova as the Australian claimed a 6-4, 6-4 victory with one break of serve in the first set and two in the second earning her the win.

“My serve proved really important,” Stosur said after the match.

“I thought I served really well the whole match. I only got broken that one time at the start of the second set. I was really pleased to be able to break back and keep the form going on serve.”

The former US Open winner will face Camila Giorgi, who beat Tamara Korpatsch 6-4, 6-2.