The No. 4-seeded Suarez Navarro defeated Elina Svitolina of Ukraine 6-1, 6-4. In her seventh quarterfinal of the season, Suarez Navarro will play the fifth-seeded Flipkens, who routed Camila Giorgi of Italy 6-2, 6-1.
In a first-round match, Karin Knapp of Italy overcame six double-faults to defeat 2007 champion Daniela Hantuchova of Slovakia 6-2, 7-6 (6).
Alexandra Cadantu of Romania beat Melanie Klaffner of Austria 7-6 (4), 6-2 and will play either top-seeded Angelique Kerber or fellow Romanian Monica Niculescu.