1977 ATP Buenos Aires (April) – Singles

Guillermo Vilas defeated Wojtek Fibak 6–4, 6–3, 6–0 to win the  April 1977 ATP Buenos Aires singles competition. Vilas was the defending champion.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1) 🇦🇷 Guillermo Vilas (Champion)
 * 2) 🇵🇱 Wojciech Fibak (Final)

Key

 * NB: All rounds up to but not including the final were the best of 3 sets. The final was the best of 5 sets.