1989 Tokyo Indoor – Singles

Boris Becker was the defending champion, but did not participate this year.

Aaron Krickstein won the tournament, beating Carl-Uwe Steeb in the final, 6–2, 6–2.

Seeds

 * 1) 🇸🇪 Stefan Edberg (semifinals)
 * 2) 🇺🇸 Andre Agassi (second round)
 * 3)  Jakob Hlasek (second round)
 * 4) 🇺🇸 Aaron Krickstein (champion)
 * 5)  Carl-Uwe Steeb (final)
 * 6) 🇪🇨 Andrés Gómez (second round)
 * 7) 🇺🇸 Kevin Curren (first round)
 * 8) 🇺🇸 Dan Goldie (second round)