1990 Yugoslav Open – Singles

The first edition of the ATP tournament in Umag was held from 14 May until 20 May 1990.

Goran Prpić won the title by defeating Goran Ivanišević 6–3, 4–6, 6–4 in the final.

Seeds
• # Goran Prpić (champion)

• # Goran Ivanišević (final)

• # Mark Koevermans (second round)

• # 🇩🇪 Jens Woehrmann (first round)

• # Andrei Cherkasov (semifinals)

• # 🇫🇮 Aki Rahunen (quarterfinals)

• # 🇨🇿 Marián Vajda (second round)

• # 🇫🇷 Thierry Tulasne (first round)