River Plate will face bitter rivals Boca Juniors in a rematch of last season's Copa Libertadores decider after the defending champions overcame Cerro Porteno in the quarter-finals.
Thursday's 1-1 draw away to Paraguayan side Cerro Porteno was enough for River to reach the semi-finals 3-1 on aggregate.
River, who are seeking back-to-back titles, carried a 2-0 lead into the second leg thanks to goals from Ignacio Fernandez and Rafael Borre in Buenos Aires.
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Cerro Porteno sparked hope of a comeback in the eighth minute when former Borussia Dortmund forward Nelson Valdez put the home side ahead on the night.