Errani coasts into last eight
Defending champion Sara Errani eased into the quarter-finals of the Abierto Mexicano Telcel as the top three seeds all won in Acapulco.
Number one seed Errani of Italy broke the resistance of Canada's Eugenie Bouchard in a first-set tie-break before racing through the second for a 7-6 (7/4) 6-2 win.
She will next play fifth seed Kiki Bertens of Holland, who eased past Spain's Maria Jose Martinez Sanchez 6-1 6-2.
Meanwhile, second seed Carla Suarez Navarro of Spain saw off France's Stephanie Foretz Gacon 6-1 6-2 and number three Alize Cornet overcame Spaniard Estrella Cabeza Candela 6-4 6-4.
Not all the seeds progressed though.
Fourth seed Irina-Camelia Begu and eighth seed Romina Oprandi were beaten respectively by Silvia Soler-Espinosa and Karin Knapp, who will face each other in the quarter-finals.
There were also wins for Francesca Schiavone and Lourdes Dominguez Lino.