| Giraldilla Int. XD | 2018/10/31 16:20 | Kai Schaefer v Mark Caljouw | W | 0-2 |
| Giraldilla Int. XD | 2018/11/22 12:40 | Mark Caljouw v Eetu Heino | W | 2-0 |
| Giraldilla Int. XD | 2018/11/02 10:20 | Rajiv Ouseph v Mark Caljouw | L | 2-0 |
| Giraldilla Int. XD | 2018/11/01 14:50 | Feixiang Sun v Mark Caljouw | W | 0-2 |
| Giraldilla Int. XD | 2018/10/31 16:20 | Kai Schaefer v Mark Caljouw | W | 0-2 |
| French Open | 2018/10/23 10:40 | Mark Caljouw v Hans-Kristian Vittinghus | L | 1-2 |
| Denmark Open | 2018/10/17 16:00 | Anders Antonsen v Mark Caljouw | L | 2-0 |
| Dutch Open | 2018/10/13 15:30 | Mark Caljouw v Sourabh Verma | L | 0-2 |
| Dutch Open | 2018/10/12 16:30 | Mark Caljouw v Joo Ven Soong | W | 2-0 |
| Giraldilla Int. XD | 2018/11/22 13:20 | Christo Popov v Kai Schaefer | W | 1-2 |
| Giraldilla Int. XD | 2018/11/21 18:00 | Joshua Magee v Kai Schaefer | W | 1-2 |
| Giraldilla Int. XD | 2018/10/31 16:20 | Kai Schaefer v Mark Caljouw | L | 0-2 |
| Giraldilla Int. XD | 2018/10/30 18:45 | David Kramer v Kai Schaefer | W | 0-2 |
| Giraldilla Int. XD | 2018/09/28 08:30 | Kai Schaefer v Subhankar Dey | L | 1-2 |
| Polish Int. | 2018/09/23 14:00 | Harsheel Dani v Kai Schaefer | W | 1-2 |
| Polish Int. | 2018/09/23 09:20 | Iikka Heino v Kai Schaefer | W | 0-2 |
| Polish Int. | 2018/09/22 12:00 | Rasmus Messerschmidt v Kai Schaefer | W | 0-2 |