Errani, who is the defending champion in Acapulco and was runner-up at Dubai last week, dispatched her Romanian opponent 6-3, 6-2 Tuesday in 1 hour, 25 minutes.
Second-seeded Carla Suarez Navarro of Spain had little trouble with France's Mathilde Johansson 6-1, 6-0, and third-seeded Alize Cornet of France out-dueled Catalina Castano of Colombia 6-1, 2-6, 6-3.
Francesca Schavione of Italy needed three sets to eliminate Grace Min of the United States 6-4, 4-6, 6-2, and qualifier Maria Jose Martinez Sanchez beat Alexandra Panova of Russia 6-3, 6-1.
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