Stadium: Court 1 Round: 25 Ground: Hardcourt indoor
| ITF - M25 Budapesta | 2021/09/29 11:45 | Buvaysar Gadamauri v Lenny Hampel | 6-2,6-4 |
| ITF - M25 Budapesta | 2021/09/28 10:15 | Andre Biro v Lenny Hampel | 3-6,0-6 |
| Challenger - Tulln | 2021/09/05 09:00 | Matteo Martineau v Lenny Hampel | 6-3,6-2 |
| ITF - M15 Bad Waltersdorf | 2021/09/02 09:45 | Lenny Hampel v Timo Stodder | 6-4,4-6,2-6 |
| ITF - M15 Bad Waltersdorf | 2021/09/01 12:10 | Lenny Hampel v Matic Dimic | 6-3,6-2 |
| ITF - M25 Frankfurt am Main | 2021/08/10 08:25 | Lenny Hampel v Adrian Oetzbach | 2-6,6-0,2-10 |
| ITF - M25 Frankfurt am Main | 2021/08/09 09:00 | Lenny Hampel v Neil Oberleitner | 6-4,6-4 |
| ITF - M25 Wetzlar | 2021/08/05 09:00 | Lenny Hampel v Alexey Vatutin | 2-6,2-6 |
| ITF - M15 Sozopol | 2021/10/14 17:15 | Alexander Cozbinov v Marko Tepavac | 2-6,5-7 |
| ITF - M15 Sozopol | 2021/10/14 12:30 | Alexander Cozbinov v Valentin Vanta | 6-2,6-1 |
| ITF - M15 Sozopol | 2021/10/08 07:00 | Yan Bondarevskiy v Alexander Cozbinov | 1-6,6-2,6-1 |
| ITF - M15 Sozopol | 2021/10/07 06:50 | Anthony Genov v Alexander Cozbinov | 3-6,1-6 |
| ITF - M15 Sozopol | 2021/10/06 09:35 | Martin Dimitrov v Alexander Cozbinov | 1-6,3-6 |
| ITF - M25 Skopje | 2021/10/01 12:30 | Alexander Cozbinov v Matteo Arnaldi | 0-6,1-6 |
| ITF - M25 Skopje | 2021/10/01 08:15 | Alexander Cozbinov v Stefano Battaglino | 6-2,7-5 |
| ITF - M25 Skopje | 2021/09/28 11:15 | Mariano Navone v Alexander Cozbinov | 6-3,5-7,1-6 |