| Singles | |
|---|---|
| 1978 South American Championships | |
| 1977 Champion |  Guillermo Vilas | 
| Champion |  José Luis Clerc | 
| Runner-up |  Víctor Pecci | 
| 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.
 Corrado Barazzutti (semifinals) Corrado Barazzutti (semifinals)
 Harold Solomon (semifinals) Harold Solomon (semifinals)
.svg.png.webp) José Higueras (quarterfinals) José Higueras (quarterfinals)
 José Luis Clerc (champion) José Luis Clerc (champion)
 Hans Gildemeister (first round) Hans Gildemeister (first round)
 Paolo Bertolucci (second round) Paolo Bertolucci (second round)
 Jaime Fillol (first round) Jaime Fillol (first round)
 Chris Lewis (quarterfinals) Chris Lewis (quarterfinals)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- SE = Special exempt
- PR = Protected ranking
- ITF = ITF entry
- JE = Junior exempt
- w/o = Walkover
- r = Retired
- d = Defaulted
- SR = Special ranking
External links
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