Top seed Jelena Jankovic cruised into the last four of the Copa Colsanitas with a 6-2 6-1 win over Alexandra Cadantu in Bogota.
Jankovic, who is the only seed left standing in a tournament full of upsets, was never troubled by her Romanian opponent.
Her semi-final opponent will be Italy's Karin Knapp, who claimed a 6-3 6-3 win over Spain's Lara Arruabarrena-Vecino.
World No 198 Paula Ormaechea's run continued as she saw off Maria-Teresa Torro-Flor 6-1 7-5.
Torro-Flor is ranked exactly 100 places above the Argentinean, but was broken six times on the way to defeat.
Ormaechea meets Teliana Pereira of Brazil next after she coasted to a 6-1 6-2 victory over Mandy Minella.