| Hungarian Int. | 2023/11/02 12:45 | Koenig, Joel v Bruno Carvalho | W | 2-0 |
| Dutch Open | 2023/10/12 14:00 | Koenig, Joel v Christensen, Jeppe Bruun | L | 0-2 |
| Nouvelle Aquitane Future Series | 2023/07/08 00:50 | Bruno Carvalho v Koenig, Joel | L | 2-1 |
| Nouvelle Aquitane Future Series | 2023/07/07 14:00 | Neil Bhabuta v Koenig, Joel | W | 0-2 |
| Nouvelle Aquitane Future Series | 2023/07/07 08:20 | Paul Tournefier v Koenig, Joel | W | 0-2 |
| Bonn Int. | 2023/06/01 12:00 | Koenig, Joel v Kho Wibowo, H. | L | 0-2 |
| Open de Suède | 2023/05/12 10:10 | Koenig, Joel v Burestedt, Felix | L | 1-2 |
| Luxembourg Open | 2023/05/05 11:40 | Simon Baron-Vezilier v Koenig, Joel | L | 2-1 |
| Hungarian Int. | 2023/11/02 13:20 | Heino, Iikka v Nicolas A. Mueller | W | 2-1 |
| Scottish Open | 2023/10/06 08:40 | Heino, Iikka v Jan Louda | L | 0-2 |
| Scottish Open Qual | 2023/10/05 13:05 | Heino, Iikka v Felix Wright | W | 2-0 |
| Scottish Open Qual | 2023/10/05 10:20 | Heino, Iikka v Salim Ben Boudinar | W | 2-0 |
| Lithuanian Int. | 2023/06/10 09:05 | Nicolas A. Mueller v Heino, Iikka | L | 2-1 |
| Lithuanian Int. | 2023/06/09 10:55 | Heino, Iikka v Cholan Kayan | W | 2-0 |
| Open de Suède - Qualif. | 2023/05/11 12:00 | Heino, Iikka v Oleksii Titov | W | 2-0 |
| Open de Suède - Qualif. | 2023/05/11 07:40 | Jia Jie Tan v Heino, Iikka | W | 0-2 |