| Indonesia Masters XD | 2018/07/18 04:30 | Sai Praneeth B. v Yu Igarashi | W | 1-2 |
| Giraldilla Int. XD | 2018/06/20 21:40 | Kwang Hee Heo v Yu Igarashi | L | 2-0 |
| Giraldilla Int. XD | 2018/05/10 08:25 | Yu Igarashi v Tommy Sugiarto | L | 0-2 |
| Giraldilla Int. XD | 2018/05/09 07:30 | Pengbo Ren v Yu Igarashi | W | 1-2 |
| Giraldilla Int. XD | 2018/05/03 05:30 | Kantaphon Wangcharoen v Yu Igarashi | L | 2-1 |
| Giraldilla Int. XD | 2018/05/02 04:00 | Yu Igarashi v Wei Feng Chong | W | 2-0 |
| Giraldilla Int. XD | 2018/04/08 02:30 | Kodai Naraoka v Yu Igarashi | W | 1-2 |
| Giraldilla Int. XD | 2018/04/07 03:30 | Minoru Koga v Yu Igarashi | W | 0-2 |
| 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 |
| 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 |