| Date | 28 July 2021 | |
|---|---|---|
| Location | Ariake Tennis Forest Park, Ariake, Koto, Tokyo, Japan | |
| Chair Umpire | James Keothavong |  GBR |
| Seed | Competitor | NOC | Sets Won | Sets Won | Set 1 | Set 2 | |
|---|---|---|---|---|---|---|---|
| – | Kei Nishikori |  JPN | 2 | 2 | 7 | 6 | |
| – | Illia Ivashka |  BLR | 0 | 0 | 6 | 0 |
| Kei Nishikori | Illia Ivashka | |
|---|---|---|
| Sets Won | 2 | 0 |
| Set 1 | 7 | 6 |
| Set 2 | 6 | 0 |
| Tie-break 1 | 9 | 7 |
