Managed by Juan Carlos Lorenzo, Unión made a great campaign in the 1975 Nacional with Suñé, goalkeeper Hugo Gatti, midfielder Victorio Cocco and forwards Ernesto Mastrángelo and Leopoldo Luque among others.

December 22, 1976 was the most remembered day in Suñé's career, when he scored the only goal of the 1976 final vs River Plate after shooting a free kick.

The final was held in Racing Club Stadium and Suñé's goal allowed Boca Juniors to win not only the Superclásico but their 20th.

In 1984, he suffered a bout of severe depression and a suicide attempt, but he recovered and took up a coaching role with the Boca Juniors youth team.

[5]Despite the Boca–River match being broadcast on television, it was believed that there was no surviving record of that goal (only a photographic sequence published by El Gráfico served as approach).

A short movie depicting some moments prior to the free kick and the goal was screened at the Passion for Boca Juniors Museum of Buenos Aires.