Stadium: Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Sharm El Sheikh | 2020/11/02 08:00 | Deviatiarov, Marat v Ayap, Sagadat | 6-3,6-0 |
| ITF M15 Novomoskovsk | 2020/09/03 07:00 | Oleksii Krutykh v Deviatiarov, Marat | 3-6,6-3,7-6 |
| ITF M15 Novomoskovsk | 2020/09/02 08:40 | Deviatiarov, Marat v Maulenov, Timur | 7-6,7-6 |
| UTF Invitational | 2020/06/12 13:30 | Nikita Mashtakov v Deviatiarov, Marat | 2-6,6-3,7-6 |
| UTF Invitational | 2020/06/11 11:30 | Deviatiarov, Marat v Shumeiko, Pavel | 6-1,6-1 |
| UTF Invitational | 2020/06/10 07:00 | Manafov, Vladyslav v Deviatiarov, Marat | 6-1,7-5 |
| UTF Invitational | 2020/06/09 09:00 | Oleksii Krutykh v Deviatiarov, Marat | 3-6,4-5 |
| ITF - M15 Doha | 2020/03/12 13:55 | Ianakiev, Milen v Deviatiarov, Marat | 2-6,0-6 |
| ITF - M15 Sharm El Sheikh | 2020/11/02 08:00 | Alec Beckley v Issei Okamura | 3-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2020/11/01 08:00 | Leo Borg v Issei Okamura | 1-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2020/10/25 10:00 | Issei Okamura v Max Houkes | 2-6,6-4,5-10 |
| ITF - M15 Sharm El Sheikh | 2020/10/18 09:00 | Issei Okamura v Max Houkes | 6-7,6-2,5-10 |
| ITF M15 Sintra | 2020/09/13 10:00 | Bovy, Arnaud v Issei Okamura | 6-0,6-0 |
| ITF M15 Sintra | 2020/09/07 10:00 | Joao Lucas Reis da Silva v Issei Okamura | 7-5,7-6 |
| ITF M15 Sintra | 2020/09/06 10:00 | Tennyson Whiting v Issei Okamura | 4-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2020/03/11 08:00 | Issei Okamura v Noah Thurner | 6-1,6-4 |