| German Championship | 2021/12/08 09:00 | Christoph Negritu v Peters, Flemming | 5-7,7-5,6-4 |
| ITF - M15 Monastir | 2021/11/09 09:00 | Christoph Negritu v Simon Beaupain | 6-3,5-7,3-6 |
| ITF - M15 Monastir | 2021/11/06 08:30 | Clement Tabur v Christoph Negritu | 4-6,6-2,6-3 |
| ITF - M15 Monastir | 2021/11/05 11:00 | Christoph Negritu v Ugo Blanchet | 6-4,6-2 |
| ITF - M15 Monastir | 2021/11/04 12:30 | Christoph Negritu v Nikita Volonski | 6-2,6-2 |
| ITF - M15 Monastir | 2021/11/03 10:45 | Christoph Negritu v Rojas, O. | 7-5,7-6 |
| ITF - M15 Monastir | 2021/10/26 10:00 | Robin Bertrand v Christoph Negritu | 6-2,3-6,6-2 |
| ITF - M15 Monastir | 2021/10/01 09:35 | Christoph Negritu v Brymer, Gage | 6-3,5-7,4-6 |
| German Championship | 2021/12/08 09:00 | Seifert, Stefan v Torski, Osman | 6-1,6-3 |
| German Championship | 2020/12/10 10:30 | Seifert, Stefan v Walder, Jordi | 4-6,6-1,3-6 |
| German Championship | 2020/12/07 15:30 | Seifert, Stefan v Eisenzapf, David | 6-1,6-4 |
| DTB German Pro Series | 2020/06/26 09:30 | Tom Schonenberg v Seifert, Stefan | 6-4,6-2 |
| DTB German Pro Series | 2020/06/25 08:00 | Kai Wehnelt v Seifert, Stefan | 6-4,6-2 |
| DTB German Pro Series | 2020/06/23 08:00 | Marvin Moeller v Seifert, Stefan | 4-6,6-3,7-5 |
| ITF - M15 Oberhaching | 2020/02/20 11:00 | Jakub Paul v Seifert, Stefan | 6-4,6-7,6-4 |
| ITF - M15 Héraklion | 2020/02/13 08:30 | Antonio Massara v Seifert, Stefan | 6-3,7-5 |