| Singapore Open - Qualifikation | 2022/07/12 01:20 | Kai Schaefer v Kalle Koljonen | L | 2-0 |
| All England Open | 2017/02/28 19:00 | Kai Schaefer v Kalle Koljonen | W | 1-2 |
| Polish Open | 2024/03/22 11:40 | Kalle Koljonen v Aria Dinata | W | 2-1 |
| Orleans Masters | 2024/03/14 13:40 | Alex Lanier v Kalle Koljonen | L | 2-0 |
| Orleans Masters | 2024/03/13 17:45 | Kalle Koljonen v Kevin Cordon | W | 2-0 |
| German Open | 2024/02/29 15:20 | Su Li Yang v Kalle Koljonen | L | 2-0 |
| German Open | 2024/02/28 20:15 | Kalle Koljonen v Ade Resky Dwicahyo | W | 2-0 |
| Azerbaijan International | 2024/02/11 06:00 | Kalle Koljonen v Sameer Verma | L | 1-2 |
| Azerbaijan International | 2024/02/10 13:00 | Daniil Dubovenko v Kalle Koljonen | W | 0-2 |
| Azerbaijan International | 2024/02/10 07:00 | Ansh Vishal Gupta v Kalle Koljonen | W | 0-2 |
| Polish Open | 2024/03/22 14:40 | Kai Schaefer v Markus Barth | W | 2-0 |
| Orleans Masters - Qualifikation | 2024/03/12 13:40 | Daniil Dubovenko v Kai Schaefer | L | 2-1 |
| Orleans Masters - Qualifikation | 2024/03/12 11:55 | Kai Schaefer v Danylo Bosniuk | W | 2-0 |
| Portugal International | 2024/03/09 17:20 | Matthias Kicklitz v Kai Schaefer | L | 2-0 |
| Portugal International | 2024/03/09 10:40 | Kai Schaefer v Rafael Gavois | W | 2-0 |
| Portugal International | 2024/03/08 10:40 | Kai Schaefer v Aria Dinata | W | 2-1 |
| German Open - Qualifikation | 2024/02/27 08:00 | S. Sankar Muthusamy Subramanian v Kai Schaefer | L | 2-0 |
| Europameisterschaft - Team | 2024/02/16 09:00 | Jan Louda v Kai Schaefer | L | 2-1 |