Katowice, Poland (Sports Network) - Top seeds Petra Kvitova and Roberta
Vinci moved into the quarterfinals at the inaugural Katowice Open.
The world No. 8 former Wimbledon champion Kvitova handled Luxembourg's Mandy
Minella 7-5, 6-2, while Vinci came from behind to beat Dutchwoman Kiki Bertens
2-6, 6-3, 6-4 on the indoor surface at Spodek.
The Czech Kvitova's quarterfinal opponent on Friday will be Croat Petra
Martic, while the Italian Vinci will battle Czech wild card Karolina Pliskova.
In other second-round play on Day 4, Israeli lucky loser Shahar Peer whipped
38-year-old American qualifier Jill Craybas 6-1, 6-3 and qualifier Alexandra
Cadantu overcame Romanian compatriot Irina-Camelia Begu 4-6, 6-3, 6-4.
Friday's other quarters will pit Peer against Cadantu and German
Annika Beck versus Italian qualifier Maria Elena Camerin.
This week's winner will pocket $40,000.
The Sports Network