| Welsh International | 2023/11/30 09:00 | Lucas Claerbout v Joel Koenig | L | 2-0 |
| Irish Open | 2023/11/16 12:00 | Samuel Hsiao v Joel Koenig | L | 2-0 |
| Hungarian Int. | 2023/11/03 09:40 | Joel Koenig v Iikka Heino | L | 0-2 |
| Hungarian Int. | 2023/11/02 12:45 | Joel Koenig v Bruno Carvalho | W | 2-0 |
| Dutch Open | 2023/10/12 14:00 | Joel Koenig v Jeppe Bruun Christensen | L | 0-2 |
| Nouvelle Aquitane Future Series | 2023/07/08 00:50 | Bruno Carvalho v Joel Koenig | L | 2-1 |
| Nouvelle Aquitane Future Series | 2023/07/07 14:00 | Neil Bhabuta v Joel Koenig | W | 0-2 |
| Nouvelle Aquitane Future Series | 2023/07/07 08:20 | Paul Tournefier v Joel Koenig | W | 0-2 |
| Estonian Int. | 2024/01/12 14:00 | Mads Juel Moller v Jia Wei Joel Koh | D | 1-1 |
| Estonian Int. | 2024/01/12 09:55 | Jia Wei Joel Koh v Markus Barth | W | 2-1 |
| KL Masters | 2023/11/02 05:45 | Jason Gunawan v Jia Wei Joel Koh | L | 2-0 |
| KL Masters | 2023/11/01 05:15 | Faiz Rozain v Jia Wei Joel Koh | W | 1-2 |
| Vietnam Open | 2023/09/13 13:20 | Jia Heng Jason Teh v Jia Wei Joel Koh | L | 2-0 |
| Indonesia Masters | 2023/09/06 08:25 | Kiran George v Jia Wei Joel Koh | L | 2-0 |
| Jocurile Asiei de Sud-Est | 2023/05/13 05:30 | Jia Wei Joel Koh v Jun Hao Leong | L | 0-2 |
| Thailand Masters - Feminin | 2023/01/31 04:00 | Jia Wei Joel Koh v Hyeok Jin Jeon | L | 0-2 |