They lit up centre court on Wednesday at the Universidad Católica, as did six-seed Barbara Las Heras and Veronica Virseda, who played the Italian-French combination of Carolina Orsi and Lea Godallier.
Local player Andrea Koch featured last alongside Argentinian teenager Maria Laura Ferreyra, taking on Spaniards Marina Guinart and Nuria Rodriguez.
Watch all of the centre court highlights in the video below!
Games in chronological order:
Barbara Las Heras (ESP)/Veronica Virseda (ESP) (6) vs Carolina Orsi (ITA)/Lea Godallier (FRA)
Lucia Sainz (ESP)/Aranza Osoro (ARG) (5) vs Ariadna Cañellas (ESP)/Ksenia Sharifova (RUS)
Marina Guinart (ESP)/Nuria Rodriguez (ESP) vs Andrea Koch (CHL)/Maria Laura Ferreyra (ARG) (W.C.)