| Giraldilla International DX | 2018/06/20 19:40 | Sitthikom Thammasin v Kai Schaefer | L | 2-0 |
| Giraldilla International DX | 2018/06/20 01:00 | Kevin Cordon v Kai Schaefer | W | 0-2 |
| Giraldilla International DX | 2018/06/13 23:40 | Xiaodong Sheng v Kai Schaefer | L | 2-1 |
| Masters d'Indonesia DX | 2018/05/23 03:00 | Wing Ki Vincent Wong v Kai Schaefer | L | 2-1 |
| Masters d'Indonesia DX | 2018/05/22 03:00 | Kenta Nishimoto v Kai Schaefer | L | 2-1 |
| Masters d'Indonesia DX | 2018/05/20 12:00 | Tien Chen Chou v Kai Schaefer | L | 2-0 |
| Masters d'Indonesia DX | 2018/04/24 09:00 | Jacob Nilsson v Kai Schaefer | L | 2-0 |
| Giraldilla International DX | 2018/04/06 07:30 | Kai Schaefer v Eetu Heino | L | 0-2 |
| Open di Svizzera DF - Qual. | 2018/07/10 01:52 | Rahul Yadav Chittaboina v Firman Abdul Kholik | L | 2-1 |
| Masters d'Indonesia DX | 2018/05/23 09:00 | Firman Abdul Kholik v Young Woong Ha | W | 2-1 |
| Masters d'Indonesia DX | 2018/05/22 14:00 | Firman Abdul Kholik v Pannawit Thongnuam | W | 2-0 |
| Masters d'Indonesia DX | 2018/05/20 04:00 | Firman Abdul Kholik v Paul-Antoine Dostie-Guindon | W | 2-0 |
| Giraldilla International DX | 2018/05/01 23:30 | Kwang Hee Heo v Firman Abdul Kholik | L | 2-1 |
| China Masters | 2018/04/10 01:40 | Yu Hsien Lin v Firman Abdul Kholik | L | 2-0 |
| Masters d'Indonesia DX | 2018/02/10 12:00 | Dong Keun Lee v Firman Abdul Kholik | W | 1-2 |
| Open di Svizzera DF - Qual. | 2018/01/23 03:00 | Kantaphon Wangcharoen v Firman Abdul Kholik | L | 2-1 |