PRAGUE — Third-seeded Qiang Wang reached the quarterfinals of the Prague Open by defeating Mandy Minella 6-1, 4-6, 6-4 on Wednesday. The Chinese player will next face unseeded Bernarda Pera, after the American dispatched Antonia Lottner 6-2, 6-4. Sixth-seeded Katerina Siniakova eased past wild-card entry Jana Cepelova 6-1, 6-3 to set up an all-Czech quarterfinal
