1989 Geneva Open – Singles

Marián Vajda was the defending champion, but did not participate this year.

Marc Rosset won the title, defeating Guillermo Pérez Roldán 6–4, 7–5 in the final.

Seeds

 * 1) 🇦🇷 Alberto Mancini (first round)
 * 2) 🇪🇸 Sergi Bruguera (first round)
 * 3) 🇪🇨 Andrés Gómez (second round)
 * 4) 🇦🇷 Guillermo Pérez Roldán (final)
 * 5)  Goran Ivanišević (first round)
 * 6)  Marcelo Filippini (second round)
 * 7) 🇫🇷 Guy Forget (first round)
 * 8)  Bruno Orešar (first round)