Dominika Cibulkova of Slovakia routed Katarzyna Piter of Poland 6-0, 6-1 in 52 minutes Thursday to reach the quarterfinals of the Generali Ladies.
Piter, playing in her first main draw of the year, broke the seventh-seeded Cibulkova in the second set for her only game.
In her fourth quarterfinal of the season, former finalist Cibulkova will take on two-time champion Ana Ivanovic.
Also, Patricia Mayr-Achleitner of Austria lost two match points at 5-3 in the second set before defeating Maryna Zanevska of Ukraine 6-1, 6-7 (1), 6-4 to set up a quarterfinal against top-seeded Angelique Kerber or Alexandra Cadantu of Romania.
Stefanie Voegele of Switzerland rallied to defeat Karin Knapp of Italy 4-6, 6-2, 7-5 to advance to her third quarterfinal of the season and first since April.