Ground: Hardcourt indoor
| German Championship | 2021/12/10 12:00 | Stefan Seifert v Luca Gelhardt | 4-6,5-7 |
| German Championship | 2021/12/09 10:00 | Christoph Negritu v Stefan Seifert | 6-2,4-6,5-6 |
| German Championship | 2021/12/08 09:00 | Stefan Seifert v Osman Torski | 6-1,6-3 |
| German Championship | 2020/12/10 10:30 | Stefan Seifert v Jordi Walder | 4-6,6-1,3-6 |
| German Championship | 2020/12/07 15:30 | Stefan Seifert v David Eisenzapf | 6-1,6-4 |
| DTB German Pro Series | 2020/06/26 09:30 | Tom Schonenberg v Stefan Seifert | 6-4,6-2 |
| DTB German Pro Series | 2020/06/25 08:00 | Kai Wehnelt v Stefan Seifert | 6-4,6-2 |
| DTB German Pro Series | 2020/06/23 08:00 | Marvin Moeller v Stefan Seifert | 4-6,6-3,7-5 |