1990 Swiss Indoors – Singles

Jim Courier was the defending champion, but lost in the second round to Andrei Cherkasov.

Third-seeded John McEnroe won the title by defeating Goran Ivanišević 6–7(4–7), 4–6, 7–6(7–3), 6–3, 6–4 in the final.

Seeds
• # 🇪🇨 Andrés Gómez (first round)

• # Goran Ivanišević (final)

• # 🇺🇸 John McEnroe (champion)

• # Andrei Chesnokov (second round)

• # 🇺🇸 Jim Courier (second round)

• # 🇸🇪 Magnus Gustafsson (quarterfinals)

• # Karel Nováček (second round)

• # Marc Rosset (first round)