| Polish Int. | 2018/09/21 15:45 | Rasmus Messerschmidt v Siddharth Pratap Singh | W | 2-0 |
| Polish Int. | 2018/09/21 11:05 | Chih Chieh Yang v Rasmus Messerschmidt | W | 0-2 |
| Swiss Open WD Qual | 2018/09/12 11:00 | Rasmus Messerschmidt v Karan Rajan Rajarajan | L | 0-2 |
| Giraldilla Int. XD | 2018/08/30 11:50 | Misha Zilberman v Rasmus Messerschmidt | L | 2-1 |
| Giraldilla Int. XD | 2018/08/29 09:20 | Rasmus Messerschmidt v Alexander Roovers | W | 2-0 |
| Swiss Open WD Qual | 2018/08/28 12:47 | Manuel Vasquez v Rasmus Messerschmidt | W | 0-2 |
| Swiss Open WD Qual | 2018/08/28 10:45 | Rasmus Messerschmidt v Christo Popov | W | 2-1 |
| Giraldilla Int. XD | 2018/03/11 11:00 | Rasmus Messerschmidt v Felix Burestedt | W | 2-0 |
| Giraldilla Int. XD | 2018/08/29 12:50 | Yu Igarashi v Kai Schaefer | L | 2-0 |
| All England Open | 2018/07/31 09:40 | Kai Schaefer v Hans-Kristian Vittinghus | L | 1-2 |
| Swiss Open WD Qual | 2018/07/17 00:55 | Kai Schaefer v Firman Abdul Kholik | L | 1-2 |
| 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 |