David Ferrer in Argentina semis
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"It will be a tough match," Ferrer said. "Each time I have played Tommy, it has been a close match and I will have to play at my best to beat him."
Ferrer holds a 5-2 edge in head-to-head matches with Robredo, including wins in the past two.
With his No. 4 ranking, Ferrer is a strong favorite to win his second tournament of the season. He defeated Almagro in last year's final.
Ferrer won the Heineken Open last month in Auckland, New Zealand, and will be going for his second title in two months.
Seven-time French Open champion Rafael Nadal skipped this event on his Latin American tour, after making his comeback from a knee injury by playing in Chile and Brazil. He will play next week in Acapulco, Mexico.
Copyright 2013 by The Associated Press