Stadium: Court 5 Round: 62
| 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 |
| Challenger Winnipeg Qual | 2018/07/08 18:05 | Sem Verbeek v Jumpei Yamasaki | 7-6,7-6 |
| ITF Hong Kong F1 | 2018/06/29 02:00 | Jumpei Yamasaki v Yuki Mochizuki | 4-6,4-6 |
| ITF Korea F4 | 2018/08/11 01:00 | Dukyoung Kim v Seung-Hun Shin | 3-6,3-6 |
| ITF Korea F3 Qual | 2018/06/16 03:30 | Dukyoung Kim v Seong Jae Han | 6-3,4-6,1-6 |
| ITF Korea F2 | 2018/06/10 05:00 | Ku Keon Kang v Dukyoung Kim | 6-2,6-4 |
| ITF Korea F1 | 2018/06/06 05:15 | Sang-Woo Noh v Dukyoung Kim | 6-4,6-1 |
| ITF Korea F3 Qual | 2017/06/12 03:00 | Dong-Kyu Lee v Dukyoung Kim | 6-4,6-1 |
| ITF Korea F3 Qual | 2017/06/11 03:00 | Dukyoung Kim v Hyeong Don Kim | 6-1,6-2 |
| ITF Korea F3 Qual | 2017/06/10 02:00 | Dukyoung Kim v Jae-Won Choi | 6-4,6-4 |
| ITF Korea F2 Qual | 2017/06/03 03:00 | Sang Yeop Kim v Dukyoung Kim | 6-3,3-6,6-4 |