1977 ATP Buenos Aires (November) – Singles

Guillermo Vilas defeated Jaime Fillol Sr. 6–2, 7–5, 3–6, 6–3 to win the November 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)  Jaime Fillol Sr. (Final)

Draw

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