| Croatian International | 2023/09/29 08:00 | Karl Kert v Mykhailo Vyshnevyi | W | 2-0 |
| Lettland - Latvia International | 2023/09/02 06:40 | Aria Dinata v Karl Kert | L | 2-0 |
| Lettland - Latvia International | 2023/09/01 10:00 | Mateusz Danielak v Karl Kert | W | 0-2 |
| Europaspiele | 2023/06/26 08:30 | Toma Junior Popov v Karl Kert | L | 2-0 |
| Lithuanian International | 2023/06/09 13:15 | Rui Yang Ryan Tan v Karl Kert | L | 2-1 |
| Austrian Open - Qualifikation | 2023/05/25 08:35 | Harsheel Dani v Karl Kert | L | 2-0 |
| Swedish Open - Qualifikation | 2023/05/11 07:35 | Marcus Viscovich v Karl Kert | L | 2-0 |
| Polish Open - Qualifikation | 2023/03/22 16:10 | Daniel S Farid v Karl Kert | L | 2-1 |
| Croatian International | 2023/09/29 10:20 | David Silva v Valentin Singer | W | 0-2 |
| Belgian International | 2023/09/14 10:40 | Julien Carraggi v Valentin Singer | L | 2-0 |
| Lettland - Latvia International | 2023/09/03 06:20 | Daniil Dubovenko v Valentin Singer | L | 2-1 |
| Lettland - Latvia International | 2023/09/02 12:20 | Kian-Yu Oei v Valentin Singer | W | 1-2 |
| Lettland - Latvia International | 2023/09/02 07:10 | Tauri Kilk v Valentin Singer | W | 1-2 |
| Lettland - Latvia International | 2023/09/01 12:30 | Viacheslav Yakovlev v Valentin Singer | W | 0-2 |
| Nouvelle Aquitane Future Series | 2023/07/07 12:40 | Valentin Singer v Thomas Fourcade | L | 0-2 |
| Nouvelle Aquitane Future Series | 2023/07/07 08:45 | Valentin Singer v Gustav Bjorkler | W | 2-0 |