Stadion: Court 7 Round: 25 Ground: Clay
| ITF - M15 - Tabarka | 2019/05/02 08:30 | Kazuma Kawachi v Rafael Matos | 4-6,4-6 |
| ITF - M15 - Tabarka | 2019/04/30 10:10 | Juan P Canas Garcia v Kazuma Kawachi | 2-6,4-6 |
| ITF M25 Matsuyama | 2019/04/09 01:00 | Kazuma Kawachi v Tomohiro Masabayashi | 5-7,6-4,3-10 |
| ITF - M15 - Mornington | 2019/03/28 00:50 | Rinky Hijikata v Kazuma Kawachi | 6-1,6-4 |
| ITF - M15 - Mornington | 2019/03/25 23:00 | Kazuma Kawachi v Mustafa Ibraimi | 6-2,6-4 |
| ITF - M15 - Mornington | 2019/03/24 23:00 | Kazuma Kawachi v Sam Ryan Ziegann | 6-2,6-1 |
| ITF - M15 - Mornington | 2019/03/21 01:45 | Christopher O'Connell v Kazuma Kawachi | 6-2,6-2 |
| ITF - M15 - Mornington | 2019/03/20 02:15 | Brandon Walkin v Kazuma Kawachi | 6-3,3-6,4-6 |
| ITF - M15 - Tabarka | 2019/05/01 11:10 | Florian Lakat v Ken Onishi | 6-3,4-6,6-0 |
| ITF - M15 - Tabarka | 2019/04/29 08:00 | Mason Recci v Ken Onishi | 4-6,1-6 |
| ITF M25 Matsuyama | 2019/04/09 02:50 | Gage Brymer v Ken Onishi | 7-6,6-2 |
| ITF - M15 - Tsukuba | 2019/03/25 01:00 | Ryuki Matsuda v Ken Onishi | 6-2,6-3 |
| ITF M15 Kofu | 2019/03/18 00:30 | Mick Veldheer v Ken Onishi | 7-5,6-2 |
| ITF - M15 - Sharm El Sheikh | 2019/03/11 08:00 | Ken Onishi v George Tsivadze | 3-6,6-2,8-10 |
| ITF - M15 - Sharm El Sheikh | 2019/03/06 12:35 | Ken Onishi v George Tsivadze | 3-6,6-2,3-6 |
| ITF - Pakistan F3 | 2018/12/17 05:30 | Ken Onishi v Lorenzo Bocchi | 6-7,3-6 |