Stadium: Court 4 Round: 25 Ground: Hardcourt indoor
| ITF M15 Monastir | 2021/03/04 11:15 | Naoki Tajima v Franco Agamenone | 0-6,3-6 |
| ITF M15 Monastir | 2021/03/03 13:20 | Stefano Reitano v Naoki Tajima | 1-6,0-6 |
| ITF M15 Monastir | 2021/02/23 08:00 | Alexis Gautier v Naoki Tajima | 7-5,6-4 |
| ITF M15 Monastir | 2021/02/18 11:00 | Naoki Tajima v Jose Fco. Vidal Azorin | 3-6,5-7 |
| ITF M15 Monastir | 2021/02/16 13:00 | Marvin Moeller v Naoki Tajima | 2-6,3-6 |
| ITF M15 Monastir | 2021/02/09 08:30 | Naoki Tajima v Naoki Nakagawa | 5-7,0-6 |
| ITF M15 Cairo | 2021/01/28 10:30 | Lenny Hampel v Naoki Tajima | 6-1,6-4 |
| ITF M15 Cairo | 2021/01/27 07:30 | Muthu A Senthilkumar v Naoki Tajima | 1-6,1-6 |
| ITF M15 Kazan | 2021/03/13 08:00 | Alexey Zakharov v Alibek Kachmazov | 7-5,6-3 |
| ITF M15 Kazan | 2021/03/12 09:05 | Alexey Zakharov v Alexandr Binda | 6-2,7-6 |
| ITF M15 Kazan | 2021/03/11 08:00 | Alexey Zakharov v Yaraslav Shyla | 6-3,6-2 |
| ITF M15 Kazan | 2021/03/09 12:15 | Alexey Zakharov v Igor Kudriashov | 4-6,6-2,6-3 |
| Challenger St. Petersburg | 2021/02/28 09:20 | Alessandro Bega v Alexey Zakharov | 6-4,6-2 |
| Challenger Nur-Sultan | 2021/02/22 04:00 | Pavel Kotov v Alexey Zakharov | 7-5,1-6,6-3 |
| Challenger Nur-Sultan | 2021/02/21 07:05 | Grigoriy Lomakin v Alexey Zakharov | 2-6,3-6 |
| ITF M15 St Petersburg | 2021/02/10 07:00 | Matic Spec v Alexey Zakharov | 4-6,6-1,6-3 |