| OS 2020 - Herrar | 2021/07/25 11:00 | Kantaphon Wangcharoen v Kai Schaefer | L | 2-0 |
| Giraldilla Int. - Mixed dubbel | 2018/02/21 09:20 | Kantaphon Wangcharoen v Kai Schaefer | L | 2-0 |
| Belgian Int. | 2021/10/28 08:30 | Ade Resky Dwicahyo v Kai Schaefer | L | 2-1 |
| OS 2020 - Herrar | 2021/07/27 01:40 | Toby Penty v Kai Schaefer | L | 2-0 |
| OS 2020 - Herrar | 2021/07/25 11:00 | Kantaphon Wangcharoen v Kai Schaefer | L | 2-0 |
| Spain Int | 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 |
| Portuguese Int. | 2021/05/07 14:30 | Kai Schaefer v Johnnie Torjussen | L | 0-2 |
| EM | 2021/04/28 12:20 | Kai Schaefer v Anders Antonsen | L | 0-2 |
| Orleans Masters | 2021/03/25 11:30 | Kai Schaefer v Ditlev Jaeger Holm | L | 0-2 |
| VM | 2021/12/13 11:40 | Felix Burestedt v Kantaphon Wangcharoen | W | 1-2 |
| Indonesia Open | 2021/11/23 01:20 | Hans-Kristian Vittinghus v Kantaphon Wangcharoen | L | 2-0 |
| Indonesia Masters | 2021/11/16 09:50 | Koki Watanabe v Kantaphon Wangcharoen | L | 2-0 |
| Hylo Open | 2021/11/05 11:00 | Kantaphon Wangcharoen v Zii Jia Lee | L | 0-2 |
| Hylo Open | 2021/11/04 12:30 | Sourabh Verma v Kantaphon Wangcharoen | W | 0-2 |
| Hylo Open | 2021/11/03 16:05 | Brian Yang v Kantaphon Wangcharoen | W | 0-2 |
| French Open | 2021/10/26 11:20 | Kantaphon Wangcharoen v Thomas Rouxel | L | 1-2 |
| Denmark Open | 2021/10/19 07:40 | Tommy Sugiarto v Kantaphon Wangcharoen | L | 2-0 |