Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Quinta Do Lago | 2021/10/24 10:00 | Naoki Nakagawa v Arthur Cazaux | 3-6,4-6 |
| ITF M25 Quinta Do Lago | 2021/10/23 11:05 | Naoki Nakagawa v Kaichi Uchida | 6-3,6-2 |
| ITF M25 Quinta Do Lago | 2021/10/22 09:25 | Roberto Ortega-Olmedo v Naoki Nakagawa | 7-6,3-6,6-7 |
| ITF M25 Quinta Do Lago | 2021/10/21 09:00 | Stuart Parker v Naoki Nakagawa | 1-6,6-7 |
| ITF M25 Quinta Do Lago | 2021/10/19 12:50 | Naoki Nakagawa v Petros Chrysochos | 7-6,6-1 |
| ITF M25 Decatur | 2021/08/02 15:00 | Naoki Nakagawa v Eliot Spizzirri | 6-7,1-6 |
| ITF M25 Champaign | 2021/07/31 16:50 | Gijs Brouwer v Naoki Nakagawa | 6-1,4-6,6-1 |
| ITF M25 Champaign | 2021/07/30 17:40 | Joshua Peck v Naoki Nakagawa | 3-6,1-6 |
| ITF M25 Quinta Do Lago | 2021/10/22 09:30 | Kaichi Uchida v Anton Matusevich | 6-4,5-7,6-4 |
| ITF M25 Quinta Do Lago | 2021/10/21 11:35 | Mick Veldheer v Anton Matusevich | 4-6,6-4,4-6 |
| ITF M25 Quinta Do Lago | 2021/10/20 10:30 | Alan F R Fierros v Anton Matusevich | 0-6,4-6 |
| Challenger Biel | 2021/09/20 09:00 | Hiroki Moriya v Anton Matusevich | 6-4,5-7,6-4 |
| Challenger Biel | 2021/09/19 08:00 | Anton Matusevich v Alessandro Bega | 6-2,6-1 |
| ITF M25 Sintra | 2021/09/09 11:25 | Anton Matusevich v Paul Jubb | 6-7,6-7 |
| ITF M25 Sintra | 2021/09/08 09:00 | Anton Matusevich v Daniel Little | 6-4,6-4 |
| ITF M25 Idanha-A-Nova | 2021/07/23 09:00 | Anton Matusevich v Gilbert S K Junior | 3-6,3-6 |