| Irish Open | 2023/11/16 12:00 | Samuel Hsiao v Koenig, Joel | L | 2-0 |
| Hungarian Int. | 2023/11/03 09:40 | Koenig, Joel v Heino, Iikka | L | 0-2 |
| 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 |
| Irish Open Qual | 2023/11/15 20:40 | Angus Meldrum v Kian-Yu Oei | L | 0-2 |
| Irish Open Qual | 2023/11/15 13:10 | Archie Bult v Angus Meldrum | W | 0-2 |
| Irish Open Qual | 2023/11/15 11:55 | Adarsh Palani Kumar v Angus Meldrum | W | 1-2 |
| Latvia Int. Qual | 2023/08/31 11:15 | Angus Meldrum v Aaron Sonnenschein | L | 0-2 |
| Latvia Int. Qual | 2023/08/30 16:40 | Angus Meldrum v Davis Strazdins | W | 2-0 |
| Nouvelle Aquitane Future Series Qual | 2023/07/06 08:45 | Angus Meldrum v Ratchaphol Srithong | L | 0-2 |