Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| 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 Hong Kong F1 | 2018/06/28 02:00 | Chukang Wang v Jumpei Yamasaki | 0-6,2-6 |
| ITF Hong Kong F1 | 2018/06/27 03:45 | Anthony Jackie Tang v Jumpei Yamasaki | 7-5,3-6,1-6 |
| ITF Hong Kong F1 | 2018/06/26 03:15 | Wei-De Lin v Jumpei Yamasaki | 3-6,3-6 |
| ITF Korea F3 | 2018/06/22 04:55 | Soonwoo Kwon v Jumpei Yamasaki | 6-3,6-1 |