Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF Thailand F4 | 2018/09/26 02:30 | Karunuday Singh v Jumpei Yamasaki | 6-4,7-5 |
| Challenger Kaohsiung | 2018/09/16 03:00 | Yuichi Sugita v Jumpei Yamasaki | 6-2,7-5 |
| Challenger - Shanghai | 2018/09/09 03:00 | Tung-Lin Wu v Jumpei Yamasaki | 6-2,6-2 |
| Challenger - Shanghai | 2018/09/08 03:00 | Abhinav Sanjeev Shanmugam v Jumpei Yamasaki | 4-6,7-6,3-6 |
| ITF Korea F5 | 2018/08/21 03:00 | Jumpei Yamasaki v Oh-Hee Kwon | 4-6,4-6 |
| 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 |
| ITF Thailand F4 | 2018/09/22 02:30 | Hao Yuan Ng v Prachaya Baibong | 6-7,6-3,6-4 |
| ITF Thailand F3 | 2018/09/03 02:00 | Palaphoom Kovapitukted v Prachaya Baibong | 6-1,6-3 |
| ITF Thailand F3 | 2018/09/02 02:00 | Prachaya Baibong v Gregory Nitayamekin | 6-0,6-0 |