| | Top level | Event type
Singles, Men – Match 3/4
| Date | 31 July 2021 | |
|---|---|---|
| Location | Ariake Tennis Forest Park, Ariake, Koto, Tokyo, Japan | |
| Chair Umpire | Nico Helwerth |  GER |
| Seed | Competitor | NOC | Sets Won | Set 1 | Set 2 | Set 3 | |
|---|---|---|---|---|---|---|---|
| – | Pablo Carreño Busta |  ESP | 2 | 6 | 6 | 6 | |
| – | Novak Đoković |  SRB | 1 | 4 | 7 | 3 |
| Pablo Carreño Busta | Novak Đoković | |
|---|---|---|
| Sets Won | 2 | 1 |
| Set 1 | 6 | 4 |
| Set 2 | 6 | 7 |
| Set 3 | 6 | 3 |
| Tie-break 2 | 6 | 8 |