Fognini and Bolelli bested the Argentine duo 6-7 (6-8), 7-6 (10-8), 7-6 (7-3), 6-4 at Mar del Plata in the best-of-five opening-round Davis Cup confrontation.
Friday's Day 1 had Berlocq rallying for a 4-6, 6-0, 6-2, 6-1 win over Seppi and Fognini besting Monaco 7-5, 6-2, 6-2.
The Italy-Argentina winner will next either the United States or Great Britain in April's quarterfinals.
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