Stadium: Court 3 Round: 26 Ground: Hardcourt indoor
| ITF M25 Hamburg | 2021/10/19 14:00 | Hampel, Lenny v Cozbinov, Alexander | 6-4,6-2 |
| ITF M25 Budapest | 2021/09/29 11:45 | Buvaysar Gadamauri v Hampel, Lenny | 6-2,6-4 |
| ITF M25 Budapest | 2021/09/28 10:15 | Andre Biro v Hampel, Lenny | 3-6,0-6 |
| Challenger Tulln | 2021/09/05 09:00 | Matteo Martineau v Hampel, Lenny | 6-3,6-2 |
| ITF M15 Bad Waltersdorf | 2021/09/02 09:45 | Hampel, Lenny v Timo Stodder | 6-4,4-6,2-6 |
| ITF M15 Bad Waltersdorf | 2021/09/01 12:10 | Hampel, Lenny v Matic Dimic | 6-3,6-2 |
| ITF M25 Frankfurt am Main | 2021/08/10 08:25 | Hampel, Lenny v Adrian Oetzbach | 2-6,6-0,2-10 |
| ITF M25 Frankfurt am Main | 2021/08/09 09:00 | Hampel, Lenny v Neil Oberleitner | 6-4,6-4 |
| ITF M25 Hamburg | 2021/10/19 08:00 | Sandkaulen, Tim v Marvin Moeller | 6-4,7-5 |
| ITF M25 Hamburg | 2021/10/17 14:50 | Dhoe, Benjamin v Sandkaulen, Tim | 6-7,6-2,5-10 |
| ITF M25 Hamburg | 2021/10/17 11:10 | Alen Moritz Hodzic v Sandkaulen, Tim | 6-7,1-6 |
| UTR Pro Tennis Series Mulheim | 2021/10/16 08:00 | Sandkaulen, Tim v Eric Vanshelboim | 0-0 |
| UTR Pro Tennis Series Mulheim | 2021/10/15 08:30 | Dzhavakian, Yurii v Sandkaulen, Tim | 0-0 |
| UTR Pro Tennis Series Mulheim | 2021/10/14 13:00 | Edison Ambarzumjan v Sandkaulen, Tim | 3-6,0-5 |
| UTR Pro Tennis Series Mulheim | 2021/10/13 10:00 | Weng, Jing Long v Sandkaulen, Tim | 3-6,2-5 |
| UTR Pro Tennis Series Mulheim | 2021/10/11 07:00 | Schmitz, Constantin v Sandkaulen, Tim | 6-4,7-5 |