"Amazing statistics this week", Kvitova said. "The nerves are always there, and I just try to play as well as I can and win".
Buzarnescu dedicated the victory to her family and coaching team, those close to her who believed she could rescue her career after two knee surgeries, and twice being sidelined for more than two years. Buzarnescu got broken in the third game of the second set and Petra cemented her lead after saving a couple of break points in game six, gaining the momentum and earning another break in game seven to cross the finish line on own serve in the following game after an ace.
The Czech fourth seed beat Germany's Goerges 6-1 6-4 in 67 minutes.
In the other quarter-finals, Slovakia's Magdalena Rybarikova saw off Slovenian Dalila Jakupovic 6-2 6-4.