1989 Estoril Open – Singles

Isabel Cueto won in the final 7–6, 6–2 against Sandra Cecchini.

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


 * 1) n/a
 * 2) 🇦🇹 Barbara Paulus (quarterfinals)
 * 3)  Isabel Cueto (champion)
 * 4) 🇮🇹 Sandra Cecchini (final)
 * 5) 🇦🇹 Judith Wiesner (second round)
 * 6)  Regina Rajchrtová (quarterfinals)
 * 7) 🇦🇷 Patricia Tarabini (semifinals)
 * 8) 🇮🇹 Laura Garrone (quarterfinals)