Terry Moor was the defending champion, but lost in the quarterfinals to Mel Purcell.
Ivan Lendl won the title, defeating Eliot Teltscher in the final, 3–6, 6–4, 6–0.
Seeds
Draw
Finals
Top half Section 1
Section 2
Bottom half Section 3
Section 4
References
External links 1980 Japan Open men's singles draw