Stadium: Court Lisboa Round: 19 Ground: Clay
| Challenger Lisbon | 2021/09/26 10:45 | Christopher Heyman v Lucas Gerch | 4-6,7-6,5-7 |
| 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 |
| Challenger Lisbon | 2021/09/26 14:00 | Daniel Michalski v Giovanni Fonio | 6-4,7-5 |
| Challenger Braga | 2021/09/20 09:00 | Daniel Michalski v Santiago Rodriguez Taverna | 2-6,3-6 |
| Challenger Braga | 2021/09/19 09:00 | Nicolas Moreno De Alboran v Daniel Michalski | 4-6,4-6 |
| Challenger Szczecin | 2021/09/13 13:40 | Daniel Michalski v Thai-Son Kwiatkowski | 3-6,6-4,1-6 |
| Challenger Warsaw | 2021/08/25 08:00 | Daniel Michalski v Nino Serdarusic | 3-6,4-6 |
| Challenger Warsaw | 2021/08/23 09:00 | Christopher Heyman v Daniel Michalski | 5-7,3-6 |
| Challenger Warsaw | 2021/08/22 09:00 | Wojciech Marek v Daniel Michalski | 6-7,1-6 |
| ITF M15 Lodz | 2021/08/20 10:15 | Daniel Michalski v Gilbert S K Junior | 6-4,3-6,3-6 |