| International du Portugal Qualif. | 2022/03/10 16:30 | Jaeger, Jonas v Karl Kert | W | 0-2 |
| International du Portugal Qualif. | 2022/03/10 09:40 | Karl Kert v Arthur Boudier | W | 2-0 |
| Open de Slovaquie | 2022/03/04 09:50 | Jiri Kral v Karl Kert | L | 2-0 |
| Open de Suède - Qualif. | 2022/01/20 16:40 | Dominik Kwinta v Karl Kert | L | 2-0 |
| Open de Suède - Qualif. | 2022/01/20 12:40 | Karl Kert v Mikolaj Szymanowski | W | 2-1 |
| Open de Suède - Qualif. | 2022/01/20 09:40 | Karl Kert v Slegers, Adrien | W | 2-0 |
| Estonie Int. - | 2022/01/14 11:40 | Karl Kert v Karunaratne, Niluka | L | 0-2 |
| Polish Int. Qual | 2021/09/23 13:20 | Tarun Reddy Katam v Karl Kert | L | 2-0 |
| International du Portugal Qualif. | 2022/03/10 10:00 | Stoynov, Ilyan v Nicolas A. Mueller | W | 0-2 |
| Italian Int. | 2021/12/17 13:20 | Kim Kristensen, D. v Nicolas A. Mueller | L | 2-1 |
| Italian Int. Qual | 2021/12/16 16:45 | Nicolas A. Mueller v Rafael Gavois | W | 2-1 |
| Italian Int. Qual | 2021/12/16 14:00 | Kian-Yu Oei v Nicolas A. Mueller | W | 1-2 |
| Italian Int. Qual | 2021/12/16 10:55 | Nicolas A. Mueller v Ragnar Sepp | W | 2-0 |
| Bulgarian Int | 2021/10/08 08:55 | Nicolas A. Mueller v Brian Holtschke | L | 0-2 |
| Hellas Int. | 2021/09/03 10:05 | Nicolas A. Mueller v Shahyar Shaqeem | L | 1-2 |
| Latvia Int. | 2021/08/28 08:00 | Joonas Korhonen v Nicolas A. Mueller | L | 2-0 |