Fifth-seeded Sara Errani of Italy beat Maria-Teresa Torro-Flor 6-1, 6-0 at the Barcelona Open on Tuesday.
Fellow Italian Alberta Brianti topped third-seeded Tsvetana Pironkova 6-1, 6-2, while Mirjana Lucic of Croatia's first win of the season was a 7-6 (4), 6-3 victory over No. 4 Ekaterina Makarova of Russia.
Czech player Lucie Hradecka followed her first career title at Fez, Morocco, by beating seventh-seeded Iveta Benesova 6-4, 6-4.
Meanwhile, Laura Pous-Tio of Spain was a 6-3, 6-3 winner over No. 9 Barbora Zahlavova Strycova.
Also, Argentina's Gisela Dulko rallied from a 5-3 deficit to earn a 7-5, 6-4 win over Kimiko Date-Krumm.
Polona Hercog, Varvara Lepchenko and Virginie Razzano were other first-round winners.