Stadium: Court 3 Round: 26 Ground: Hardcourt indoor
| ITF M25 - Hamburg | 2021/10/19 14:00 | Lenny Hampel v Alexander Cozbinov | 6-4,6-2 |
| 'ITF M25 Boedapest | 2021/09/29 11:45 | Buvaysar Gadamauri v Lenny Hampel | 6-2,6-4 |
| 'ITF M25 Boedapest | 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 - Hamburg | 2021/10/19 08:00 | Tim Sandkaulen v Marvin Moeller | 6-4,7-5 |
| ITF M25 - Hamburg | 2021/10/17 14:50 | Benjamin Dhoe v Tim Sandkaulen | 6-7,6-2,5-10 |
| ITF M25 - Hamburg | 2021/10/17 11:10 | Alen Moritz Hodzic v Tim Sandkaulen | 6-7,1-6 |
| UTR Pro Tennis Series - Mulheim | 2021/10/16 08:00 | Tim Sandkaulen v Eric Vanshelboim | 0-0 |
| UTR Pro Tennis Series - Mulheim | 2021/10/15 08:30 | Yurii Dzhavakian v Tim Sandkaulen | 0-0 |
| UTR Pro Tennis Series - Mulheim | 2021/10/14 13:00 | Edison Ambarzumjan v Tim Sandkaulen | 3-6,0-5 |
| UTR Pro Tennis Series - Mulheim | 2021/10/13 10:00 | Jing L Weng v Tim Sandkaulen | 3-6,2-5 |
| UTR Pro Tennis Series - Mulheim | 2021/10/11 07:00 | Constantin Schmitz v Tim Sandkaulen | 6-4,7-5 |