| Polish Int. Qual | 2021/09/23 13:20 | Tarun Reddy Katam v Karl Kert | L | 2-0 |
| Polish Int. Qual | 2021/09/23 12:00 | Gal Bizjak v Karl Kert | W | 0-2 |
| Latvia Int. | 2021/08/27 11:00 | Bernardo Atilano v Karl Kert | L | 2-0 |
| Lithuanian Int. | 2021/06/11 09:40 | Alvaro Vazquez v Karl Kert | L | 2-0 |
| Austrian Open Qual | 2021/05/27 14:20 | Karl Kert v Magnus Johannesen | L | 1-2 |
| Austrian Open Qual | 2021/05/27 10:00 | Samuel Cassar v Karl Kert | W | 0-2 |
| Slovenia Int. | 2021/05/20 12:00 | Ivan Rusev v Karl Kert | L | 2-0 |
| Portuguese Int. Qual | 2021/05/06 12:00 | Martin Bundgaard v Karl Kert | L | 2-1 |
| Denmark Masters | 2021/08/06 07:35 | Niluka Karunaratne v Kiran George | L | 0-2 |
| Olympics 2020 - Men | 2021/07/26 10:20 | Nhat Nguyen v Niluka Karunaratne | L | 2-0 |
| Olympics 2020 - Men | 2021/07/24 11:00 | Tzu Wei Wang v Niluka Karunaratne | L | 2-0 |
| Portuguese Int. | 2021/05/09 09:00 | Niluka Karunaratne v Max Weisskirchen | L | 0-2 |
| Portuguese Int. | 2021/05/08 14:20 | Raul Must v Niluka Karunaratne | W | 0-2 |
| Portuguese Int. | 2021/05/08 09:20 | Niluka Karunaratne v Kim Bruun | W | 2-1 |
| Polish Open | 2021/03/26 10:50 | Niluka Karunaratne v Aryamann Tandon | L | 0-2 |
| Uganda Int. | 2020/02/23 12:00 | Niluka Karunaratne v Gergely Krausz | L | 1-2 |