1978 South American Championships (tennis)

The 1978 South American Championships was a men's Grand Prix tennis circuit tournament held in Buenos Aires, Argentina and played on outdoor clay courts. The event was held from 20 November through 26 November 1978. Fourth-seeded José Luis Clerc won the singles title.

Singles
🇦🇷 José Luis Clerc defeated Víctor Pecci 6–4, 6–4
 * It was Clerc's 2nd singles title of the year and of his career.

Doubles
🇳🇿 Chris Lewis / 🇺🇸 Van Winitsky defeated 🇦🇷 José Luis Clerc / Belus Prajoux 6–4, 3–6, 6–0
 * It was Lewis' 3rd title of the year and the 5th of his career. It was Winitsky's 2nd title of the year and the 2nd of his career.