| US Open 2019, MS | 2023/07/12 19:10 | Kai Schaefer v Koo Takahashi | L | 0-2 |
| Canada Open 2019, MS, Qualification | 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 |
| Open de Thaïlande - Qualif. | 2023/05/30 06:55 | Chia Hao Lee v Kai Schaefer | L | 2-1 |
| Masters de Malaisie - Qualif. | 2023/05/23 02:00 | Christian Adinata v Kai Schaefer | L | 2-0 |
| Sudirman Cup | 2023/05/15 02:20 | Kunlavut Vitidsarn v Kai Schaefer | L | 2-0 |
| Orléans Masters | 2023/04/05 12:40 | Lei, L. X. v Kai Schaefer | L | 2-0 |
| Masters d'Espagne - Qualif. | 2023/03/28 08:40 | Christian Adinata v Kai Schaefer | L | 2-0 |