Stadion: Court 6 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 - Monastir | 2021/10/11 13:00 | Mikail Alimli v Denis Constantin Spiridon | 7-6,6-3 |
| ITF - M15 - Monastir | 2021/10/11 08:00 | Denis Constantin Spiridon v Mohamed Amin Oueslati | 6-2,6-2 |
| ITF - M15 - Monastir | 2021/10/10 10:30 | Denis Constantin Spiridon v Fabian Hansch Mauritzson | 6-1,6-1 |
| ITF - M25 - Uriage | 2021/07/11 14:50 | Denis Constantin Spiridon v Edouard Villoslada | 1-6,1-6 |
| ITF - M15 - Novomoskovsk | 2021/05/24 12:00 | Simon A Ivanov v Denis Constantin Spiridon | 7-6,6-1 |
| ITF - M15 - Novomoskovsk | 2021/05/23 08:00 | Denis Constantin Spiridon v Illya Maksymchuk | 7-6,3-6,10-8 |
| ITF - M15 - Cancun | 2020/02/17 14:00 | Matic Spec v Denis Constantin Spiridon | 6-4,6-1 |
| ITF - M15 - Monastir | 2021/10/17 09:00 | Tushar Sharma v Ivan Kazakov | 1-6,1-6 |
| ITF - M15 - Platja D'Aro | 2021/10/10 08:00 | Ivan Kazakov v Noah Regas | 4-6,1-6 |
| ITF - M15 - Platja D'Aro | 2021/10/03 11:00 | Jorge Martinez Martinez v Ivan Kazakov | 6-7,6-3,10-2 |
| ITF - M25 - Ricany | 2021/08/30 09:00 | Antonin Stepanek v Ivan Kazakov | 6-1,7-5 |
| ITF - M25 - Posen | 2021/08/24 14:00 | Ivan Kazakov v Michal Mikula | 1-6,2-6 |
| ITF - M25 - Posen | 2021/08/24 08:00 | Ivan Kazakov v Flemming Peters | 2-6,7-5,10-3 |
| ITF - M25 - Posen | 2021/08/22 08:00 | Oscar Weightman v Ivan Kazakov | 6-3,2-6,1-10 |
| ITF - M15 - Warmbad-Villach | 2021/08/16 07:00 | Ivan Kazakov v Gonzalo Achondo | 6-3,0-6,8-10 |