Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| Challenger Kobe | 2018/11/16 04:50 | Yoshihito Nishioka v Soonwoo Kwon | 6-1,3-6,6-4 |
| Challenger Kobe | 2018/11/15 02:00 | Akira Santillan v Soonwoo Kwon | 2-6,7-5,6-7 |
| Challenger Kobe | 2018/11/14 03:20 | Renta Tokuda v Soonwoo Kwon | 3-6,6-1,1-6 |
| Challenger Shenzhen 2 | 2018/10/30 05:10 | Soonwoo Kwon v Tsung-Hua Yang | 5-7,3-6 |
| Challenger Kaohsiung | 2018/09/23 07:55 | Gael Monfils v Soonwoo Kwon | 6-4,2-6,6-1 |
| Challenger Kaohsiung | 2018/09/22 06:30 | Soonwoo Kwon v Malek Jaziri | 6-3,6-4 |
| Challenger Kaohsiung | 2018/09/21 06:00 | Soonwoo Kwon v Brayden Schnur | 6-3,6-4 |
| Challenger Kaohsiung | 2018/09/19 09:30 | Lloyd Harris v Soonwoo Kwon | 3-6,5-7 |
| ITF Japan F7 | 2018/06/07 02:00 | Sora Fukuda v Masamichi Imamura | 6-3,6-2 |
| ITF Japan F7 | 2018/06/05 01:00 | Masamichi Imamura v Takuya Kaneko | 6-2,7-5 |
| ITF Japan F4 | 2018/03/25 01:00 | Yuki Matsuo v Masamichi Imamura | 6-3,6-0 |
| ITF Japan F4 | 2018/03/24 02:00 | Masamichi Imamura v Takashi Saito | 6-4,6-4 |
| ITF Japan F3 | 2018/03/22 03:00 | Tatsuma Ito v Masamichi Imamura | 6-2,6-0 |
| ITF Japan F3 | 2018/03/20 06:00 | Masamichi Imamura v Rigele Te | 6-3,6-3 |
| ITF Japan F3 | 2018/03/18 01:00 | Masamichi Imamura v Yuta Kawahashi | 7-5,6-2 |
| ITF Japan F3 | 2018/03/17 02:30 | Cing-Yang Meng v Masamichi Imamura | 5-7,1-6 |