| Open di Svizzera DF - Qual. | 2018/12/13 09:00 | Krzysztof Jakowczuk v Maxime Tetreault | W | 2-0 |
| Open di Svizzera DF - Qual. | 2018/11/27 01:00 | Krzysztof Jakowczuk v En Chia Chang | L | 0-2 |
| Giraldilla International DX | 2018/09/21 09:55 | Chia Hung Lu v Krzysztof Jakowczuk | L | 2-0 |
| Open di Svizzera DF - Qual. | 2018/03/15 14:00 | Krzysztof Jakowczuk v Muhammad L.H. Mohd Ibrahim | L | 0-2 |
| Giraldilla International DX | 2018/02/15 08:00 | Krzysztof Jakowczuk v Jan Louda | L | 0-2 |
| Open di Svizzera DF - Qual. | 2017/12/05 09:30 | Krzysztof Jakowczuk v Jonathan Dolan | L | 1-2 |
| Giraldilla International DX | 2017/03/23 08:31 | Krzysztof Jakowczuk v Hugo Jardim | W | 2-0 |
| Giraldilla International DX | 2017/03/09 17:03 | Joel Koenig v Krzysztof Jakowczuk | W | 0-2 |
| US Open - Qual. | 2019/07/09 22:40 | Feixiang Sun v Karan Rajan Rajarajan | L | 2-0 |
| US Open - Qual. | 2019/07/09 19:10 | Cesar Adonis Brito Gonzalez v Karan Rajan Rajarajan | W | 0-2 |
| Open del Canada | 2019/07/03 17:40 | Pengbo Ren v Karan Rajan Rajarajan | L | 2-1 |
| Open del Canada | 2019/07/03 00:40 | Karan Rajan Rajarajan v Lino Munoz | W | 2-0 |
| Internazionali di Spagna - Qual. | 2019/06/13 08:10 | Karan Rajan Rajarajan v Lars Schaenzler | L | 1-2 |
| Internazionali di Spagna - Qual. | 2019/06/12 13:30 | Leo Rossi v Karan Rajan Rajarajan | W | 1-2 |
| Internazionali di Spagna - Qual. | 2019/06/12 11:30 | Karan Rajan Rajarajan v Bernardo Atilano | W | 2-1 |
| Internazionali di Lituania | 2019/06/08 08:30 | Georgii Karpov v Karan Rajan Rajarajan | L | 2-0 |