| Giraldilla International - Gemischtes Doppel | 2018/09/22 12:00 | Rasmus Messerschmidt v Kai Schaefer | L | 0-2 |
| Swedish Open | 2022/01/21 12:00 | Gustav Bjorkler v Rasmus Messerschmidt | W | 1-2 |
| Swedish Open | 2022/01/21 10:20 | Panitchaphon Teeraratsakul v Rasmus Messerschmidt | W | 1-2 |
| Scottish Open | 2021/11/26 17:40 | Rasmus Messerschmidt v Toby Penty | L | 0-2 |
| Scottish Open | 2021/11/25 21:30 | Dinuka Karunaratna v Rasmus Messerschmidt | W | 0-2 |
| Scottish Open - Qualifikation | 2021/11/25 14:50 | Rasmus Messerschmidt v Alex Lanier | W | 2-1 |
| Scottish Open - Qualifikation | 2021/11/25 11:55 | Rasmus Messerschmidt v Enogat Roy | W | 2-0 |
| Dutch Open | 2021/10/14 08:20 | Jan Louda v Rasmus Messerschmidt | L | 2-0 |
| Polen - Polish International | 2021/09/24 10:20 | Jan Louda v Rasmus Messerschmidt | L | 2-1 |
| Swedish Open | 2022/01/21 16:30 | Jacob Nilsson v Kai Schaefer | W | 1-2 |
| Swedish Open | 2022/01/21 10:20 | Jeppe Bruun Christensen v Kai Schaefer | W | 0-2 |
| Weltmeisterschaft | 2021/12/15 12:00 | Kai Schaefer v Kantaphon Wangcharoen | L | 0-2 |
| Belgian International | 2021/10/28 08:30 | Ade Resky Dwicahyo v Kai Schaefer | L | 2-1 |
| Olympische Spiele 2020 - Herren | 2021/07/27 01:40 | Toby Penty v Kai Schaefer | L | 2-0 |
| Olympische Spiele 2020 - Herren | 2021/07/25 11:00 | Kantaphon Wangcharoen v Kai Schaefer | L | 2-0 |
| Spain International | 2021/06/17 15:00 | Ivan Rusev v Kai Schaefer | L | 2-0 |
| Spain Masters | 2021/05/19 11:20 | Kai Schaefer v Lucas Claerbout | L | 1-2 |