Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF M15 - Kouvola | 2021/05/30 08:00 | Anton Matusevich v Naoki Tajima | 6-1,4-6,6-0 |
| ITF M25 - Idanha-A-Nova | 2021/07/17 08:30 | Nicolas Moreno De Alboran v Anton Matusevich | 7-6,6-4 |
| ITF M25 - Idanha-A-Nova | 2021/07/16 10:00 | Simon Carr v Anton Matusevich | 4-6,6-4,4-6 |
| ITF M25 - Idanha-A-Nova | 2021/07/15 11:30 | Garrett Johns v Anton Matusevich | 3-6,6-1,6-7 |
| ITF M25 - Idanha-A-Nova | 2021/07/13 12:15 | Thomas Fancutt v Anton Matusevich | 4-6,6-7 |
| Wimbledon | 2021/06/24 12:05 | Bernabe Zapata Miralles v Anton Matusevich | 6-2,3-6,7-6,6-7,6-3 |
| Wimbledon | 2021/06/23 12:00 | Anton Matusevich v Carlos Taberner | 6-4,6-1 |
| Wimbledon | 2021/06/22 10:00 | Anton Matusevich v William Jansen | 4-6,6-0,6-4 |
| Challenger - Nottingham | 2021/06/19 11:30 | Mackenzie McDonald v Anton Matusevich | 6-2,6-3 |
| 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 |
| ITF M15 - Kouvola | 2021/05/27 08:30 | Aleksi Lofman v Naoki Tajima | 6-3,6-7,4-6 |
| ITF M15 - Kouvola | 2021/05/26 08:55 | Leevi Saatela v Naoki Tajima | 4-6,2-6 |