Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| Challenger - Lissabon - Herredouble | 2021/09/30 15:30 | Borges/Cabral v Fanselow/Gerch | 6-4,6-4 |
| Challenger - Lissabon - Herredouble | 2021/09/29 13:55 | Geerts/Vervoort v Fanselow/Gerch | 3-6,2-6 |
| Challenger - Forli - Herredouble | 2021/06/16 14:00 | Galdos/Luz v Fanselow/Gerch | 7-5,6-4 |
| Challenger - Forli - Herredouble | 2021/06/15 15:50 | Ajdukovic/Fatic v Fanselow/Gerch | 1-6,6-3,2-10 |
| ITF M15 - Troisdorf - Herredouble | 2021/05/12 15:05 | Fanselow/Gerch v Bertola/Lipovsek Puches | 4-6,2-6 |
| ITF M25 - Vale Do Lobo - Herredouble | 2021/03/09 13:05 | Heyman/Nikles v Fanselow/Gerch | 7-6,6-4 |
| ITF - M25 Villena - Herredouble | 2021/02/04 13:30 | Fanselow/Gerch v Cervantes/Vervoort | 5-7,6-1,7-10 |
| ITF - M25 Villena - Herredouble | 2021/02/02 13:20 | Sanchez/Misrahi v Fanselow/Gerch | 0-6,1-6 |