Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF M15 - Castelo Branco | 2021/07/28 13:30 | Daniil Glinka v Jean Thirouin | 5-7,7-5,4-6 |
| ITF M25 - Telfs | 2021/07/14 14:00 | Daniil Glinka v Philip Bachmaier | 4-6,3-6 |
| ITF M25 - Velenje | 2021/07/06 10:10 | Daniil Glinka v Ronan Joncour | 6-2,3-6,5-7 |
| ITF M15 - Antalya | 2021/06/29 11:50 | Daniil Glinka v Stefanos Sakellaridis | 3-6,2-6 |
| ITF M15 - Antalya | 2021/06/28 12:20 | Daniil Glinka v Samuil Konov | 6-3,6-1 |
| ITF M15 - Antalya | 2021/06/27 06:30 | Daniil Glinka v Sergis Kyratzis | 3-6,6-4,10-8 |
| Challenger - Almaty | 2021/06/06 08:00 | Jesper De Jong v Daniil Glinka | 6-3,6-3 |
| ITF M15 - Antalya | 2021/05/25 07:00 | Daniil Glinka v Michalis Sakellaridis | 6-7,5-7 |
| ITF M15 - Castelo Branco | 2021/07/27 12:10 | Naoki Tajima v Martin Breysach | 6-3,2-6,2-6 |
| ITF M25 - Idanha-A-Nova | 2021/07/20 10:45 | Anton Matusevich v Naoki Tajima | 6-3,7-5 |
| ITF M25 - Idanha-A-Nova | 2021/07/15 09:30 | Daniel Rodrigues v Naoki Tajima | 6-3,7-5 |
| ITF M25 - Idanha-A-Nova | 2021/07/14 09:25 | Fabio Coelho v Naoki Tajima | 6-4,4-6,2-6 |
| ITF M15 - Almada | 2021/07/07 10:30 | Naoki Tajima v Martim L Prata | 3-6,2-6 |
| ITF M15 - Kouvola | 2021/05/30 08:00 | Anton Matusevich v Naoki Tajima | 6-1,4-6,6-0 |
| ITF M15 - Kouvola | 2021/05/29 07:00 | Naoki Tajima v Lorenzo Rottoli | 7-5,6-4 |
| ITF M15 - Kouvola | 2021/05/28 07:15 | Luca Castelnuovo v Naoki Tajima | 3-6,2-6 |