| Singles | |
|---|---|
| 1981 Tokyo Indoor | |
| Champion |  Vincent Van Patten |
| Runner-up |  Mark Edmondson |
| Final score | 6–2, 3–6, 6–3 |
| Draw | 32 |
| Seeds | 8 |
Jimmy Connors was the defending champion, but did not participate this year.
Unseeded Vincent Van Patten won the tournament, beating Mark Edmondson in the final, 6–2, 3–6, 6–3.
John McEnroe (semifinals)
Björn Borg (second round)
José Luis Clerc (second round) Eliot Teltscher (first round) Vitas Gerulaitis (quarterfinals)
Wojtek Fibak (quarterfinals)
Balázs Taróczy (first round)| Semifinals | Final | ||||||||||||
| 1 | John McEnroe | 3 | 5 | ||||||||||
| Vincent Van Patten | 6 | 7 | |||||||||||
| Vincent Van Patten | 6 | 3 | 6 | ||||||||||
| Mark Edmondson | 2 | 6 | 3 | ||||||||||
| Mark Edmondson | 77 | 6 | |||||||||||
 Heinz Günthardt | 64 | 4 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J McEnroe | 6 | 6 | ||||||||||||||||||||||||
| J Sadri | 2 | 2 | 1 | J McEnroe | 6 | 6 | |||||||||||||||||||||
 T Fukui | 6 | 6 | T Fukui | 3 | 2 | ||||||||||||||||||||||
| S Shiraishi | 4 | 2 | 1 | J McEnroe | 6 | 6 | |||||||||||||||||||||
| B Scanlon | 6 | 6 | B Scanlon | 4 | 3 | ||||||||||||||||||||||
| R Cano | 1 | 4 | B Scanlon | 6 | 4 | 6 | |||||||||||||||||||||
| D Gitlin | 2 | 77 | 5 | LL | C Dunk | 2 | 6 | 1 | |||||||||||||||||||
| LL | C Dunk | 6 | 63 | 7 | 1 | J McEnroe | 3 | 5 | |||||||||||||||||||
| 3 | J-L Clerc | 6 | 6 | V Van Patten | 6 | 7 | |||||||||||||||||||||
| P McNamee | 2 | 4 | 3 | J-L Clerc | 77 | 5 | 65 | ||||||||||||||||||||
| V Van Patten | 6 | 6 | V Van Patten | 64 | 7 | 77 | |||||||||||||||||||||
| J Fitzgerald | 2 | 4 | V Van Patten | 0 | 6 | 6 | |||||||||||||||||||||
 C Lewis | 6 | 7 | 5 | V Gerulaitis | 6 | 3 | 3 | ||||||||||||||||||||
| T Moor | 4 | 5 | C Lewis | 2 | 3 | ||||||||||||||||||||||
| J Bailey | 4 | 7 | 1 | 5 | V Gerulaitis | 6 | 6 | ||||||||||||||||||||
| 5 | V Gerulaitis | 6 | 5 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | W Fibak | 77 | 3 | 6 | |||||||||||||||||||||||
| M Purcell | 63 | 6 | 3 | 6 | W Fibak | 6 | 6 | ||||||||||||||||||||
| V Amaya | 3 | 6 | 67 | P Dent | 4 | 3 | |||||||||||||||||||||
| P Dent | 6 | 2 | 79 | 6 | W Fibak | 5 | 2 | ||||||||||||||||||||
| To Gullikson | 4 | 7 | 1 | M Edmondson | 7 | 6 | |||||||||||||||||||||
| M Edmondson | 6 | 5 | 6 | M Edmondson | 66 | 6 | 6 | ||||||||||||||||||||
| B Manson | 6 | 6 | B Manson | 78 | 4 | 4 | |||||||||||||||||||||
| 4 | E Teltscher | 3 | 3 | M Edmondson | 77 | 6 | |||||||||||||||||||||
| 8 | B Taróczy | 6 | 3 | 4 | H Günthardt | 64 | 4 | ||||||||||||||||||||
| H Günthardt | 4 | 6 | 6 | H Günthardt | 7 | 6 | |||||||||||||||||||||
| R Frawley | 6 | 3 | 4 | P Rennert | 5 | 3 | |||||||||||||||||||||
| P Rennert | 4 | 6 | 6 | H Günthardt | 77 | 77 | |||||||||||||||||||||
| E Takeuchi | 1 | 2 | Ti Gullikson | 63 | 62 | ||||||||||||||||||||||
| Ti Gullikson | 6 | 6 | Ti Gullikson | 6 | 6 | ||||||||||||||||||||||
 R Krishnan | 3 | 6 | 2 | 2 | B Borg | 3 | 1 | ||||||||||||||||||||
| 2 | B Borg | 6 | 4 | 6 | |||||||||||||||||||||||
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