Top-seeded Marina Erakovic of New up Gisela Dulko were a pair of second-round upset victims Thursday at the $220,000 Copa BBVA Colsanitas tennis tournament.
Romanian Edina Gallovits-Hall upended Erakovic 6-4, 6-4, while Russian Alexandra Panova knocked out the fifth-seeded Argentine Dulko in 7-5, 6-2 fashion on the red clay at the Centro de Alto Rendimiento.
Gallovits-Hall will face Colombia's Mariana Duque-Marino in Friday's quarterfinals.
Italian Karin Knapp outlasted wild card and veteran Colombian crowd favorite Catalina Castano 6-3, 2-6, 6-2, while Argentine qualifier Paula Ormaechea snuck past Slovenia's Petra Rampre 6-4, 3-6, 7-6 (7-4) on Day 4. Next up for Knapp will be Panova, while Ormaechea will encounter Spaniard Lara Arruabarrena-Vecino.
One other quarterfinal will pit Kazakhstan's Yaroslava Shvedova versus Hungarian Timea Babos.
This week's champion will claim $37,000.