Top-seeded Agnieszka Radwanska of Poland was ushered to a first-round exit by American qualifier Jamie Hampton Tuesday in an Aegon International upset.
Misaki Doi and Anna Tatishvili claimed upset wins Wednesday in second-round play of the Strasbourg International tennis tournament in France.
Top seeds Marion Bartoli and Tamira Paszek were ousted in Tuesday's first-round play at the Strasbourg International tennis tournament in France.
Laura Robson posted a Rome International tennis tournament win Monday over Venus Williams that gives her a match against world No. 1 Serena Williams.
Kaia Kanepi and Carla Suarez Navarro, who played in the tournament finals last year, on Wednesday both posted wins at the Portugal Open.
Top seeds Marion Bartoli and Dominika Cibulkova were beaten Tuesday in first-round matches at the Portugal Open.
No. 1 seed Angelique Kerber had to go three sets Saturday to set up a championship match against Anastasia Pavlyuchenkova at the Monterrey Open.
Top-seeded Angelique Kerber breezed into the semifinals of the Monterrey Open Friday with a 6-2, 6-1 decision over Ayumi Morita.
Timea Babos pulled off the biggest surprise of the tournament Wednesday by ousting No. 4 seed Ana Ivanovic in the second round of the Monterrey Open.
Sixth-seeded Yanina Wickmayer and No. 7 Urszula Radwanska each advanced with opening-day victories at the Monterrey Open in Mexico.