| Giraldilla Int. XD | 2017/01/12 12:25 | Joel Koenig v Karan Rajan Rajarajan | W | 0-2 |
| Open de Pologne - Qualif. | 2022/03/24 20:40 | Yu Jen Chi v Karan Rajan Rajarajan | L | 2-0 |
| Open de Pologne - Qualif. | 2022/03/24 16:00 | Jayant Rana v Karan Rajan Rajarajan | W | 0-2 |
| Open de Pologne - Qualif. | 2022/03/24 09:10 | Koya, Sai Charan v Karan Rajan Rajarajan | W | 1-2 |
| International du Portugal | 2022/03/13 16:00 | Karan Rajan Rajarajan v Andi Fadel Muhammad | L | 0-2 |
| International du Portugal | 2022/03/13 10:00 | Yu Jen Chi v Karan Rajan Rajarajan | W | 0-2 |
| International du Portugal | 2022/03/12 16:15 | Tharun Mannepalli v Karan Rajan Rajarajan | W | 0-2 |
| Italian Int. | 2021/12/18 15:20 | Alex Lanier v Karan Rajan Rajarajan | L | 2-0 |
| Italian Int. | 2021/12/18 08:20 | Karan Rajan Rajarajan v Fabian Roth | W | 2-1 |
| Slovenia Int. | 2022/05/19 11:30 | Enogat Roy v Joel Koenig | L | 2-0 |
| Luxembourg Open | 2022/05/06 09:40 | Joel Koenig v Magnus Johannesen | L | 0-2 |
| Dutch Int. - | 2022/04/14 09:20 | Parkhoei, Axel Henrik v Joel Koenig | L | 2-1 |
| Italian Int. | 2021/12/17 08:40 | Julien Carraggi v Joel Koenig | L | 2-0 |
| Welsh Int Qual | 2021/12/02 10:20 | Joel Koenig v Brian Holtschke | L | 0-2 |
| Welsh Int Qual | 2021/12/01 14:50 | Shaun Ekengren v Joel Koenig | W | 1-2 |
| Welsh Int Qual | 2021/12/01 10:45 | Skinner, Lloyd v Joel Koenig | W | 0-2 |
| Cyprus Int. | 2021/10/17 05:50 | Tarun Reddy Katam v Joel Koenig | L | 2-0 |