| 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 |
| 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 Ulcinj | 2021/09/20 08:00 | Gianmarco Ferrari v Osman Torski | 7-5,7-5 |
| ITF M15 Ulcinj | 2021/09/19 08:00 | Eric Morris v Osman Torski | 1-6,2-6 |
| ITF M25 Wetzlar | 2021/08/04 13:10 | Lenny Hampel v Osman Torski | 6-4,7-5 |
| ITF M25 Wetzlar | 2021/08/03 15:30 | John Sperle v Osman Torski | 3-6,3-6 |
| ITF M25 Wetzlar | 2021/08/02 14:00 | Osman Torski v Kai Lemstra | 6-4,0-6,10-5 |
| ITF M15 Antalya | 2021/06/27 06:30 | Osman Torski v Thiago Cigarran | 3-6,1-6 |
| ITF M15 Skopje | 2021/06/02 10:55 | Miljan Zekic v Osman Torski | 4-6,6-4,6-1 |
| ITF M15 Skopje | 2021/06/01 08:00 | Luka Pavlovic v Osman Torski | 6-2,2-6,5-10 |