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 | Uzhylovsky, Vladimir v Tom Schonenberg | 5-7,6-2,10-8 |
| ITF - M15 Sharm El Sheikh | 2019/10/20 08:00 | Tom Schonenberg v Mikula, Michal | 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 Gabas, Ronald | 6-1,6-0 |
| Bad Salzdetfurth, Simples M-ITF-GER-14A | 2019/10/08 09:00 | Petr Michnev v Tom Schonenberg | 2-6,6-1,11-9 |
| Bad Salzdetfurth, Simples M-ITF-GER-14A | 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 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 |
| ITF - M15 Héraklion | 2020/02/11 09:30 | Stamoulos, Ioannis v Seifert, Stefan | 0-6,6-2,3-6 |
| ITF - M15 Veigy-Foncenex | 2020/01/30 11:45 | Robert, Quentin v Seifert, Stefan | 7-6,4-6,6-3 |
| ITF - M15 Veigy-Foncenex | 2020/01/29 14:40 | Seifert, Stefan v Briand, Jurgen | 7-6,6-1 |
| ITF - M15 Veigy-Foncenex | 2020/01/27 09:00 | Seifert, Stefan v Smits, Glenn | 6-4,6-1 |