Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| ITF Thailand F3 | 2016/09/07 02:00 | Issei Okamura v Jumpei Yamasaki | 6-4,2-6,4-6 |
| Challenger Kobe | 2018/11/11 03:35 | Jacob Grills v Issei Okamura | 1-6,6-4,6-3 |
| Challenger Kobe | 2018/11/10 03:25 | Yuichi Ito v Issei Okamura | 4-6,7-6,3-6 |
| ITF Australia F8 | 2018/10/09 00:00 | Moerani Bouzige v Issei Okamura | 7-5,6-1 |
| ITF Australia F7 | 2018/10/04 03:55 | Benjamin Mitchell v Issei Okamura | 6-4,1-6,6-1 |
| ITF Australia F7 | 2018/10/02 00:00 | Issei Okamura v Vincent Stouff | 6-4,6-4 |
| ITF Australia F6 | 2018/09/25 00:30 | Connor Farren v Issei Okamura | 3-6,7-6,6-2 |
| ITF Australia F5 | 2018/09/21 01:00 | Brydan Klein v Issei Okamura | 6-3,6-2 |
| ITF Australia F5 | 2018/09/20 03:55 | Aaron Addison v Issei Okamura | 2-6,7-6,2-6 |
| ITF USA F35 | 2018/12/05 19:30 | Felix Corwin v Jumpei Yamasaki | 6-4,3-6,6-4 |
| ITF USA F35 | 2018/12/03 17:25 | Rana-Roop Singh Bhullar v Jumpei Yamasaki | 3-6,3-6 |
| ITF USA F34 | 2018/11/28 16:00 | Alexis Gautier v Jumpei Yamasaki | 6-3,6-2 |
| ITF USA F34 | 2018/11/26 17:35 | Jumpei Yamasaki v Harrison Adams | 2-6,6-4,6-0 |
| ITF Thailand F6 | 2018/10/09 05:55 | Kento Takeuchi v Jumpei Yamasaki | 6-3,0-6,7-6 |
| ITF Thailand F5 | 2018/10/05 04:00 | Jumpei Yamasaki v Shintaro Imai | 2-6,4-6 |
| ITF Thailand F5 | 2018/10/04 04:30 | Jumpei Yamasaki v Alexander Igoshin | 3-6,6-3,6-3 |
| ITF Thailand F5 | 2018/10/03 02:30 | Jumpei Yamasaki v Tsung-Hao Huang | 6-7,6-4,6-1 |