Stadium: Court 5 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/05/16 07:00 | Dmitrii Vasilev v Essa Qabazard | 4-6,7-6,10-3 |
| ITF M15 Sharm El Sheikh | 2021/02/21 15:30 | Andres Gabriel Ciurletti v Dmitrii Vasilev | 7-5,6-0 |
| UTR Pro Tennis Series Barcelona | 2021/01/30 09:30 | Francesco Vilardo v Dmitrii Vasilev | 5-7,6-3,0-4 |
| UTR Pro Tennis Series Barcelona | 2021/01/29 13:30 | Dmitrii Vasilev v Alessandro Bega | 3-6,2-6 |
| UTR Pro Tennis Series Barcelona | 2021/01/27 10:30 | Dmitrii Vasilev v Jaime Caldes | 1-6,1-6 |
| UTR Pro Tennis Series Barcelona | 2021/01/26 12:00 | Dmitrii Vasilev v Dragos Nicolae Madaras | 2-6,6-2,0-5 |
| UTR Pro Tennis Series Barcelona | 2021/01/25 13:30 | Max Andrews v Dmitrii Vasilev | 6-4,7-5 |
| ITF M15 Antalya | 2021/01/11 07:00 | Alex M Pujolras v Dmitrii Vasilev | 6-4,6-1 |
| ITF M15 Antalya | 2021/05/16 07:00 | Sebastian Bahamondes v Daisuke Sumizawa | 1-6,1-6 |
| ITF M15 Antalya | 2021/05/09 07:00 | Daisuke Sumizawa v Ignacio Carou | 6-2,1-6,8-10 |
| ITF M15 Antalya | 2021/05/02 06:00 | Orlando Luz v Daisuke Sumizawa | 6-1,6-2 |
| ITF M15 Sharm El Sheikh | 2021/03/03 09:25 | Daisuke Sumizawa v Luca Nardi | 4-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/03/02 09:20 | Arvid Nordquist v Daisuke Sumizawa | 4-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/03/01 10:00 | Matas Vasiliauskas v Daisuke Sumizawa | 0-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/02/28 11:00 | Alberto Morolli v Daisuke Sumizawa | 3-6,1-6 |
| ITF M15 Sharm El Sheikh | 2021/02/23 07:30 | Lukas Krainer v Daisuke Sumizawa | 3-6,6-3,10-5 |