The top four seeds all made it through to the semi-finals off the Copa Claro in Buenos Aires, with three Spaniards making up the final four including David Ferrer and Tommy Robredo.
Top seed Ferrer was dominant over another fellow Spaniard Albert Ramos as he dropped just three games in his commanding 6-1 6-2 victory.
He raced through the first set in clinical fashion, converting both break points he created while not facing one on his own serve.
And while he was made to work a little harder in the second set, the result was never in doubt.
Next up will be another all-Spanish battle with fourth seed Nicolas Almagro, who had a much tougher battle against Frenchman Jeremy Chardy before coming through 7-6 6-3.
Third seed Robredo made it three Spaniards in the last four with his win over Robin Haase .
Robredo was already 6-1 and 2-0 up on Holland's Robin Haase before the Dutchman was forced to retire through injury.
Italian Fabio Fognini, the second seed in Argentina, made sure it was not an all-Spanish affair in the semis as he beat Pablo Andujar 6-4 6-3.