Stadium: Center Court Mulheim Round: 1
| DTB German Pro Series | 2020/06/25 09:45 | Tom Schonenberg v Marvin Moeller | 6-4,3-6,4-6 |
| DTB German Pro Series | 2020/06/24 10:30 | Tom Schonenberg v Kai Wehnelt | 7-6,6-3 |
| ITF M15 Sharm El Sheikh | 2019/10/21 08:00 | Volodymyr Uzhylovskyi v Tom Schonenberg | 5-7,6-2,10-8 |
| ITF M15 Sharm El Sheikh | 2019/10/20 08:00 | Tom Schonenberg v Michal Mikula | 6-3,7-5 |
| ITF M15 Sharm El Sheikh | 2019/10/14 08:00 | Boris Fassbender v Tom Schonenberg | 6-4,6-3 |
| ITF M15 Sharm El Sheikh | 2019/10/13 10:00 | Tom Schonenberg v Ronald Gabas | 6-1,6-0 |
| ITF M15 Bad Salzdetfurth | 2019/10/08 09:00 | Petr Michnev v Tom Schonenberg | 2-6,6-1,11-9 |
| ITF M15 Bad Salzdetfurth | 2019/10/07 08:00 | Tom Schonenberg v Patric Prinoth | 6-3,6-0 |
| 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 |
| ITF M15 Oberhaching | 2020/02/20 11:00 | Jakub Paul v Stefan Seifert | 6-4,6-7,6-4 |
| ITF M15 Heraklion | 2020/02/13 08:30 | Antonio Massara v Stefan Seifert | 6-3,7-5 |
| ITF M15 Heraklion | 2020/02/11 09:30 | Ioannis Stamoulos v Stefan Seifert | 0-6,6-2,3-6 |
| ITF M15 Veigy-Foncenex | 2020/01/30 11:45 | Quentin Robert v Stefan Seifert | 7-6,4-6,6-3 |
| ITF M15 Veigy-Foncenex | 2020/01/29 14:40 | Stefan Seifert v Jurgen Briand | 7-6,6-1 |
| ITF M15 Veigy-Foncenex | 2020/01/27 09:00 | Stefan Seifert v Glenn Smits | 6-4,6-1 |