1990 CA-TennisTrophy – Singles

Paul Annacone was the defending champion but lost in the second round to Thomas Muster.

Anders Järryd won in the final 6–3, 6–3, 6–1 against Horst Skoff.

Seeds

 * 1) 🇦🇹 Thomas Muster (semifinals)
 * 2) 🇺🇸 John McEnroe (quarterfinals)
 * 3) 🇦🇷 Martín Jaite (quarterfinals)
 * 4) 🇦🇹 Horst Skoff (final)
 * 5) 🇩🇪 Carl-Uwe Steeb (second round)
 * 6)  Alexander Volkov (semifinals)
 * 7) 🇺🇸 Jimmy Arias (second round)
 * 8) 🇩🇪 Michael Stich (first round)