Top-seeded Venus Williams was unable to take the court Monday at the inaugural WTA Brasil Tennis Cup due to rain.
Four matches were postponed or suspended due to the weather.
Before the skies opened up, Hungarian veteran Melinda Czink upset second- seeded Yaroslava Shvedova of Kazakhstan 2-6, 6-4, 6-2. Czink converted all five of her break points.
In other action involving seeds, No. 4 Chanelle Scheepers of South Africa overcame Venezuelan qualifier Adriana Perez 2-6, 6-4, 6-0 and Romanian Monica Niculescu drove out No. 6 Anabel Medina Garrigues of Spain 5-7, 7-6 (9-7), 6-1 on the hardcourts at Federacao Catarinense de Tenis.
Other Day-2 winners were Croatian qualifier Tereza Mrdeza, Spanish qualifier Beatriz Garcia Vidagany and Frenchwoman Caroline Garcia.