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.
.@Petra_Kvitova nails her 21st winner of the day to grab the win!
Downs Siniakova, 6-3, 6-3, to reach the #PragueOpen semifinals! pic.twitter.com/MSZJrSpyzK
— WTA (@WTA) May 3, 2018
Shuai, meanwhile, downed Italian Jasmine Paolini 6-4, 6-3.
.@zhangshuai121 sets up #PragueOpen semifinal clash vs. Kvitova!
Downs Paolini, 6-4, 6-3! pic.twitter.com/7fBwEC2sFp
— WTA (@WTA) May 3, 2018
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.