Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/15 01:00 | Kazuma Kawachi v Hayato Matsuoka | 3-6,6-0,4-6 |
| 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 M25 Sapporo | 2023/09/16 01:00 | Shuichi Sekiguchi v Hikaru Shiraishi | 6-2,4-6,6-3 |
| ITF M25 Sapporo | 2023/09/05 04:55 | Hikaru Shiraishi v Ryotaro Taguchi | 4-6,6-4,0-6 |
| ITF M25 Hong Kong | 2023/08/29 02:00 | Hikaru Shiraishi v Justin Barki | 6-7,7-6,3-6 |
| ITF M25 Hong Kong | 2023/08/28 02:00 | Hikaru Shiraishi v Anthony Susanto | 6-2,6-4 |
| ITF M15 Nakhon Si Thammarat | 2023/07/08 02:00 | Ryuki Matsuda v Hikaru Shiraishi | 6-2,3-6,6-4 |
| ITF M15 Nakhon Si Thammarat | 2023/07/07 02:00 | Hikaru Shiraishi v Yurii Dzhavakian | 6-2,7-5 |
| ITF M15 Nakhon Si Thammarat | 2023/07/06 03:00 | Hikaru Shiraishi v Patrik Oplustil | 6-3,3-6,6-3 |
| ITF M15 Karuizawa | 2023/06/03 03:30 | Yuta Kawahashi v Hikaru Shiraishi | 7-5,1-6,10-7 |