Stadium: Court 10 Round: 25
| ITF Korea F5 | 2018/08/20 01:00 | Jumpei Yamasaki v Jungwon Park | 6-4,6-0 |
| ITF Korea F5 | 2018/08/18 02:00 | Jumpei Yamasaki v Dukyoung Kim | 6-4,6-4 |
| Challenger Gwangju Qual | 2018/08/12 01:30 | Yecong He v Jumpei Yamasaki | 6-2,6-4 |
| Challenger Gwangju Qual | 2018/08/11 01:30 | Fajing Sun v Jumpei Yamasaki | 1-6,6-2,2-6 |
| Challenger Jinan Qual | 2018/08/04 02:00 | Matej Sabanov v Jumpei Yamasaki | 6-4,6-4 |
| Challenger Chengdu Qual | 2018/07/28 02:00 | Miliaan Niesten v Jumpei Yamasaki | 6-2,6-2 |
| Challenger Granby Qual | 2018/07/21 16:25 | Taha Baadi v Jumpei Yamasaki | 7-6,6-4 |
| Challenger Gatineau Qual | 2018/07/14 21:55 | Jacob Grills v Jumpei Yamasaki | 6-3,6-1 |
| ITF Korea F4 | 2018/08/16 01:00 | Seong-Gook Oh v Oh-Hee Kwon | 6-4,6-4 |
| ITF Korea F4 | 2018/08/14 02:30 | Oh-Hee Kwon v Seong Taek Im | 6-3,6-4 |
| ITF Korea F3 | 2018/06/22 03:00 | Yunseong Chung v Oh-Hee Kwon | 6-4,6-1 |
| ITF Korea F3 | 2018/06/20 02:30 | Oh-Hee Kwon v Seong Chan Hong | 7-5,6-4 |
| ITF Korea F3 | 2018/06/19 06:35 | Cing-Yang Meng v Oh-Hee Kwon | 1-6,2-6 |
| ITF Korea F3 Qual | 2018/06/18 06:30 | Hyeong Don Kim v Oh-Hee Kwon | 2-6,2-6 |
| ITF Korea F3 Qual | 2018/06/17 04:30 | Seong Jae Han v Oh-Hee Kwon | 4-6,1-6 |
| ITF Korea F3 Qual | 2018/06/16 03:30 | Ki Su Jung v Oh-Hee Kwon | 0-6,1-6 |