Stadium: Court Lisboa Round: 14 Ground: Clay
| Challenger Biel | 2021/09/19 09:30 | Jakub Paul v Christopher Heyman | 7-6,4-6,7-5 |
| Challenger Istanbul | 2021/09/16 08:00 | Yasutaka Uchiyama v Christopher Heyman | 3-6,6-3,6-4 |
| Challenger Istanbul | 2021/09/14 08:40 | Christopher Heyman v Andrea Arnaboldi | 3-6,6-2,6-4 |
| Challenger Istanbul | 2021/09/13 07:30 | Geoffrey Blancaneaux v Christopher Heyman | 4-6,4-6 |
| Challenger Istanbul | 2021/09/12 08:00 | Artem Dubrivnyy v Christopher Heyman | 3-6,2-6 |
| Challenger Warsaw | 2021/08/23 09:00 | Christopher Heyman v Daniel Michalski | 5-7,3-6 |
| Challenger Warsaw | 2021/08/22 09:00 | Christopher Heyman v Patrik Niklas-Salminen | 6-1,6-3 |
| ITF M25 Koksijde | 2021/08/20 10:35 | Mathieu Perchicot v Christopher Heyman | 6-4,6-4 |
| ITF M25 Pardubice | 2021/09/22 08:00 | Tim Handel v Lucas Gerch | 7-6,7-5 |
| ITF M25 Madrid | 2021/09/15 09:20 | Lucas Gerch v Alberto Barroso Campos | 4-6,6-7 |
| Challenger Seville | 2021/09/07 11:00 | Lucas Gerch v Carlos Taberner | 1-6,4-6 |
| Challenger Seville | 2021/09/06 09:00 | Mats Rosenkranz v Lucas Gerch | 3-6,7-5,4-6 |
| Challenger Seville | 2021/09/05 10:30 | Alberto Barroso Campos v Lucas Gerch | 2-6,1-6 |
| Challenger Warsaw | 2021/08/22 13:35 | Johan Nikles v Lucas Gerch | 6-4,7-5 |
| ITF M25 Frankfurt am Main | 2021/08/14 12:05 | Lucas Gerch v Yshai Oliel | 6-4,3-6,5-7 |
| ITF M25 Frankfurt am Main | 2021/08/13 14:00 | Lucas Gerch v Louis Wessels | 3-6,6-3,6-4 |