Alfonsín's candidate in the UCR primaries, Río Negro Province Governor Horacio Massaccesi, defeated Federico Storani and Rodolfo Terragno for the nomination over their opposition to the Olivos Pact.
The candidate chosen by Alfonsín in the UCR primaries, Río Negro Province Governor Horacio Massaccesi, emerged victorious against Federico Storani and Rodolfo Terragno, who opposed the Olivos Pact, securing the nomination.