Petra Kvitova sweeps into Prague semis, but Sam Stosur out

Petra Kvitova claimed another twos-set win to reach the semi-final of the Prague Open, but Sam Stosur crashed out.

The second-seeded Kvitova beat fellow Czech and eighth seed Katerina Siniakova 6-3, 6-3 to set up a last-four match against Zhang Shuai.

However, it wasn’t as straightforward as it looked as Siniakova actually broke the two-time Grand Slam winner in the opening game of the match, but she couldn’t consolidate her advantage as Kvitova hit back immediately to make it 1-1 before claiming the crucial break in game eight.

Three breaks of serve in the second set were more than enough to earn the 28-year-old the win.

Shuai, meanwhile, downed Italian Jasmine Paolini 6-4, 6-3.

The other semi-final will be between Camila Giorgi and Mihaela Buzarnescu.

Italian Giorgi beat 2011 US Open champion Samantha Stosur 6-2, 6-3 with two breaks of serve in each set while Buzarnescu secured a 6-2, 6-3 victory over Kristyna Pliskova.