1977 Champion Guillermo Vilas Runner-up Víctor Pecci Singles Doubles | Champion José Luis Clerc Final score 6–4, 6–4 | |
Guillermo Vilas was the defending champion but did not compete that year.
José Luis Clerc won in the final 6–4, 6–4 against Víctor Pecci.
Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
References
1978 South American Championships – Singles Wikipedia(Text) CC BY-SA