Stadium: Court 7 Round: 26 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/12 02:00 | Yusuke Takahashi v Kazuma Kawachi | 6-4,3-6,2-6 |
| ITF M15 Monastir | 2023/08/23 12:35 | Kazuma Kawachi v Mohammad Alkotop | 3-6,1-6 |
| ITF M15 Monastir | 2023/08/15 13:05 | Younes Lalami Laaroussi v Kazuma Kawachi | 6-1,6-2 |
| ITF M25 Herzlia | 2023/08/08 07:50 | Orel Kimhi v Kazuma Kawachi | 7-6,6-2 |
| ITF M15 Raanana | 2023/08/01 12:20 | Kazuma Kawachi v Itamar Tapiro | 6-3,2-6,5-7 |
| ITF M15 Nakhon Si Thammarat | 2023/07/12 02:00 | Kazuma Kawachi v Amir Milushev | 2-6,6-3,6-7 |
| ITF M15 Nakhon Si Thammarat | 2023/07/05 07:50 | Kokoro Isomura v Kazuma Kawachi | 6-4,6-3 |
| ITF M15 Jakarta | 2023/06/29 02:00 | Yuta Kawahashi v Kazuma Kawachi | 6-2,7-6 |
| ITF M25 Sapporo | 2023/09/13 01:00 | Hayato Matsuoka v Ryotaro Taguchi | 6-2,3-6,6-3 |
| ITF M25 Sapporo | 2023/09/11 02:20 | Hayato Matsuoka v Chih Chi Huang | 6-2,3-6,10-4 |
| ITF M25 Rome | 2023/05/30 14:15 | Hayato Matsuoka v Marcello Serafini | 1-6,2-6 |
| ITF M25 Rome | 2023/05/29 09:30 | Grigoriy Lomakin v Hayato Matsuoka | 3-6,2-6 |
| ITF M25 Rome | 2023/05/28 08:00 | Gabriel Sardo v Hayato Matsuoka | 0-6,1-6 |
| ITF M25 Rome | 2023/05/28 07:00 | Carlo Venturini v Hayato Matsuoka | 2-6,6-7 |
| ITF M15 Prijedor | 2023/05/18 12:10 | Ergi Kirkin v Hayato Matsuoka | 6-1,6-0 |
| ITF M15 Doboj | 2023/05/12 07:00 | Ergi Kirkin v Hayato Matsuoka | 6-1,6-1 |