1990 Belgian Indoor Championships – Singles

Henri Leconte was the champion of the event when it last took place, in 1988. He participated in 1990 but lost in the first round. Boris Becker won the title, defeating Carl-Uwe Steeb 7–5, 6–2, 6–2, in the final.

Seeds
• # Boris Becker (champion)

• # Carl-Uwe Steeb (final)

• # 🇪🇸 Emilio Sánchez (first round)

• # Jakob Hlasek (second round)

• # Ronald Agénor (quarterfinals)

• # 🇸🇪 Magnus Gustafsson (semifinals)

• # 🇮🇹 Paolo Canè (quarterfinals, retired)

• # Goran Ivanišević (quarterfinals)