See main article: 1980 Tokyo Indoor. Björn Borg was the defending champion, but lost in the quarterfinals this year.
Jimmy Connors won the tournament, beating Tom Gullikson in the final, 6–1, 6–2.
Björn Borg (quarterfinals)
Jimmy Connors (champion) Vitas Gerulaitis (first round) Eliot Teltscher (second round) John Sadri (semifinals) Roscoe Tanner (second round) Victor Amaya (quarterfinals)