Stadium: CPK Round: 26 Ground: Hardcourt outdoor
| ITF M15 Nakhon Si Thammarat | 2023/07/05 07:50 | Kokoro Isomura v Kazuma Kawachi | 6-4,6-3 |
| ITF M15 Yanagawa | 2023/12/27 00:30 | Takuya Kumasaka v Kazuma Kawachi | 6-4,6-2 |
| ITF M15 Yanagawa | 2023/12/26 00:30 | Kazuma Kawachi v Shu Muto | 6-1,6-1 |
| ITF M15 Yanagawa | 2023/12/25 00:30 | Kazuma Kawachi v Seiya Nakanishi | 6-3,6-0 |
| ITF M15 Yanagawa | 2023/12/22 07:25 | Sanhui Shin v Kazuma Kawachi | 6-1,6-2 |
| ITF M15 Yanagawa | 2023/12/22 02:10 | Kazuma Kawachi v Ryotaro Matsumura | 6-4,4-6,6-4 |
| ITF M15 Yanagawa | 2023/12/21 00:30 | Yamato Sueoka v Kazuma Kawachi | 2-6,6-3,6-7 |
| ITF M15 Yanagawa | 2023/12/20 03:00 | Kazuma Kawachi v Yuto Oki | 6-2,6-4 |
| Challenger Yokkaichi | 2023/11/26 01:00 | Nathan Ponwith v Kazuma Kawachi | 6-7,6-4,7-5 |
| Challenger Burnie Qual | 2024/02/03 23:00 | Calum Puttergill v Kokoro Isomura | 6-3,6-2 |
| Challenger Burnie | 2024/01/30 02:25 | Kokoro Isomura v Shintaro Imai | 6-2,2-6,3-6 |
| Challenger Burnie | 2024/01/29 00:45 | Kokoro Isomura v Jesse Delaney | 6-4,6-2 |
| Challenger Burnie | 2024/01/28 05:25 | Kokoro Isomura v Alexander Klintcharov | 4-6,6-3,6-4 |
| ITF M15 Yanagawa | 2023/12/21 03:45 | Sanhui Shin v Kokoro Isomura | 6-3,5-7,7-6 |
| ITF M15 Yanagawa | 2023/12/21 00:30 | Kokoro Isomura v Kosuke Morita | 6-0,6-3 |
| ITF M15 Kuala Lumpur | 2023/12/01 02:00 | Yeongseok Jeong v Kokoro Isomura | 6-2,7-5 |
| ITF M15 Kuala Lumpur | 2023/11/29 04:30 | Daniel Leong Prickett v Kokoro Isomura | 3-6,6-4,3-6 |