The French Open champion will next face her doubles partner and Czech compatriot Katerina Siniakova.
Ninth-seeded Greet Minnen beat Russia’s Anastasia Gasanova 6-3, 7-6 (3). The Belgian will play Storm Sanders in the quarterfinals after the Australian came back to eliminate Nuria Parrizas Diaz of Spain 4-6, 6-3, 6-1.
French Open champ Barbora Krejcikova tops Ysaline Bonaventure to reach Prague quarters
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