American Alison Riske changed her schedule this season to include the Bank of the West Classic for a variety of reasons. One of them was to change her luck.

The 59th ranked Riske did just that, beating third-seeded Carla Suarez Navarro 6-4, 6-4 on Wednesday to reach the quarterfinals.

Riske, making her main draw debut in the event, beat a top-10 player for the first time in nearly two years and the second overall in 12 tries.

Germany's Mona Barthel also knocked off a seeded player, beating sixth-seeded compatriot Andrea Petkovic 5-7, 6-2, 7-6 (4) and could next play top-seeded Caroline Wozniacki, who makes her first appearance Thursday night.