| Australian Open | 2023/08/02 02:25 | Su Li Yang v Kai Schaefer | L | 2-0 |
| Australian Open Qual | 2023/08/01 01:25 | Kai Schaefer v Korakrit Laotrakul | W | 2-1 |
| Australian Open Qual | 2023/07/31 23:30 | Kai Schaefer v Ytharth Madaan | W | 2-0 |
| US Open | 2023/07/12 19:10 | Kai Schaefer v Koo Takahashi | L | 0-2 |
| Canada Open Qual | 2023/07/04 16:55 | Kai Schaefer v Parupalli Kashyap | L | 0-2 |
| European Games | 2023/06/28 08:30 | Luka Wraber v Kai Schaefer | W | 1-2 |
| Thailand Open Qual | 2023/05/30 06:55 | Chia Hao Lee v Kai Schaefer | L | 2-1 |
| Malaysia Masters Qual | 2023/05/23 02:00 | Christian Adinata v Kai Schaefer | L | 2-0 |