Wozniak, seeded third, defeated Regina Kulikova 6-2, 7-5 to set up a quarterfinal meeting with Alla Kudryavtseva.
The only other seeded player in action Thursday was No. 4 Lucie Safarova, who was a 6-2, 6-2 winner over Valerie Tetreault.
Qualifier Lilia Osterlog advanced with a 6-3, 2-6, 6-2 decision over Amra Sadikovic and
Bethanie Mattek-Sands defeated Vania King 6-3, 6-3.
Copyright 2009 by United Press International.