1989 Vitosha New Otani Open – Singles

Conchita Martínez was the defending champion but did not compete that year.

Isabel Cueto won in the final 6–2, 7–6 against Katerina Maleeva.

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


 * 1) 🇧🇬 Katerina Maleeva (final)
 * 2)  Isabel Cueto (champion)
 * 3) 🇮🇹 Laura Golarsa (first round)
 * 4)  Petra Langrová (quarterfinals)
 * 5) 🇮🇹 Laura Garrone (first round)
 * 6)  Sabrina Goleš (quarterfinals)
 * 7)  Angeliki Kanellopoulou (semifinals)
 * 8)  Sabine Hack (second round)