Four matches were suspended Tuesday because of rain and 12 more were either suspended or postponed Wednesday.
Wozniak got her match in in an efficient 77 minutes, stopping Olga Govortsova 6-4, 6-4. The difference in the tight match was Wozniak's success on Govortsova's second serve.
There were a pair of upsets Wednesday as sixth-seeded Ekaterina Makarova was toppled 6-3, 3-6, 6-2 by Stefanie Voegele and 12th-seeded Tamarine Tanasugarn fell 7-6 (7-5), 2-6, 6-4 to Naomi Cavaday.
In the other second-round match completed Wednesday, crowd favorite Anne Keothavong was ousted 6-1, 7-6 (7-5) by Sania Mirza.
Among the matches suspended Wednesday was Maria Sharapova's. She was ahead of Alexa Glatch 6-3, 5-4 when play was stopped.
First-round winners were No. 15-seeded Aravane Rezai, Alla Kudryavtseva, Lilia Osterloh and Chanelle Scheepers.
Copyright 2009 by United Press International.