Stadium: Court Lisboa Round: 14 Ground: Clay
| ITF M25 Wetzlar | 2021/08/08 10:00 | Peter Heller v Christopher Heyman | 6-4,6-7,6-4 |
| ITF M25 Wetzlar | 2021/08/07 14:10 | Harold Mayot v Christopher Heyman | 3-6,6-7 |
| ITF M25 Wetzlar | 2021/08/06 12:00 | Christopher Heyman v Alexey Vatutin | 6-3,7-5 |
| ITF M25 Wetzlar | 2021/08/05 11:35 | Christopher Heyman v Mats Rosenkranz | 6-4,7-6 |
| ITF M25 Wetzlar | 2021/08/04 08:00 | Christopher Heyman v Gauthier Onclin | 6-3,6-2 |
| Challenger Poznan | 2021/07/26 10:00 | Elmar Ejupovic v Christopher Heyman | 7-6,6-2 |
| Challenger Poznan | 2021/07/25 13:00 | Maks Kasnikowski v Christopher Heyman | 3-6,4-6 |
| ITF M25 Marburg | 2021/07/07 14:55 | Christopher Heyman v Henri Squire | 5-7,3-6 |
| ITF M25 Wetzlar | 2021/08/04 09:55 | Daniel Cukierman v Lucas Gerch | 6-3,2-6,6-4 |
| Challenger Poznan | 2021/07/26 11:35 | David Poljak v Lucas Gerch | 7-5,1-6,6-4 |
| Challenger Poznan | 2021/07/25 10:30 | Sebastian Fanselow v Lucas Gerch | 2-6,5-7 |
| ITF M25 The Hague | 2021/07/01 09:55 | Manuel Guinard v Lucas Gerch | 6-3,6-2 |
| ITF M25 The Hague | 2021/06/29 11:20 | Lucas Gerch v Vladimir Ivanov | 6-1,6-2 |
| Challenger Forli | 2021/06/16 09:30 | Francesco Forti v Lucas Gerch | 6-4,6-4 |
| Challenger Forli | 2021/06/15 09:30 | Lucas Gerch v Thiago Agustin Tirante | 7-6,3-6,6-3 |
| Challenger Forli | 2021/06/14 09:30 | Lucas Gerch v Elmar Ejupovic | 4-6,6-4,7-6 |