| Giraldilla Int. XD | 2018/06/20 19:40 | Sitthikom Thammasin v Kai Schaefer | L | 2-0 |
| Giraldilla Int. XD | 2018/06/20 01:00 | Kevin Cordon v Kai Schaefer | W | 0-2 |
| US Open | 2018/06/13 23:40 | Xiaodong Sheng v Kai Schaefer | L | 2-1 |
| Indonesia Masters XD | 2018/05/23 03:00 | Wing Ki Vincent Wong v Kai Schaefer | L | 2-1 |
| Indonesia Masters XD | 2018/05/22 03:00 | Kenta Nishimoto v Kai Schaefer | L | 2-1 |
| Indonesia Masters XD | 2018/05/20 12:00 | Tien Chen Chou v Kai Schaefer | L | 2-0 |
| Indonesia Masters XD | 2018/04/24 09:00 | Jacob Nilsson v Kai Schaefer | L | 2-0 |
| Giraldilla Int. XD | 2018/04/06 07:30 | Kai Schaefer v Eetu Heino | L | 0-2 |
| Giraldilla Int. XD | 2018/06/21 22:30 | Guangzu Lu v Mark Caljouw | L | 2-0 |
| Giraldilla Int. XD | 2018/06/20 18:30 | Hashiru Shimono v Mark Caljouw | W | 1-2 |
| US Open | 2018/06/17 20:00 | Dong Keun Lee v Mark Caljouw | L | 2-1 |
| US Open | 2018/06/16 20:00 | Ajay Jayaram v Mark Caljouw | W | 0-2 |
| US Open | 2018/06/16 02:15 | Mark Caljouw v Xiaodong Sheng | W | 2-0 |
| US Open | 2018/06/14 20:40 | Kalle Koljonen v Mark Caljouw | W | 1-2 |
| US Open | 2018/06/14 00:20 | Sitthikom Thammasin v Mark Caljouw | W | 0-2 |
| Indonesia Masters XD | 2018/04/26 15:00 | Jan O Jorgensen v Mark Caljouw | L | 2-0 |