| Champ: | Željko Franulović |
| Runner: |  Manuel Orantes |
| Score: | 6–4, 6–2, 6–0 |
| Type: | singles doubles |
| Before Name: | Buenos Aires tennis tournament |
See main article: 1970 ATP Buenos Aires.
Željko Franulović defeated Manuel Orantes 6–4, 6–2, 6–0 to win the 1970 ATP Buenos Aires singles competition. François Jauffret was the champion but did not defend his title.