Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| Challenger Yokkaichi | 2023/11/26 04:20 | Calum Puttergill v Kazuki Nishiwaki | 7-5,6-2 |
| Challenger Matsuyama | 2023/11/05 04:55 | Kazuki Nishiwaki v Rio Noguchi | 2-6,5-7 |
| ITF M25 Dharwad | 2023/10/20 04:30 | Kazuki Nishiwaki v Digvijay Pratap Singh | 4-6,7-6,2-6 |
| ITF M25 Dharwad | 2023/10/19 04:35 | Kazuki Nishiwaki v Madhwin Kamath | 6-4,6-4 |
| ITF M25 Dharwad | 2023/10/18 09:25 | Kazuki Nishiwaki v Ryotaro Matsumura | 6-2,7-5 |
| ITF M25 Takasaki | 2023/09/22 01:00 | Kazuki Nishiwaki v Collin Altamirano | 3-6,1-6 |
| ITF M25 Takasaki | 2023/09/21 01:50 | Kazuki Nishiwaki v Leo Vithoontien | 5-7,6-4,6-4 |
| ITF M25 Takasaki | 2023/09/20 02:40 | Kazuki Nishiwaki v Taisei Miyamoto | 6-3,6-0 |
| ITF M15 Ipoh Perak | 2023/11/26 01:30 | Alexey Zakharov v Takuya Kumasaka | 6-0,6-3 |
| ITF M15 Ipoh Perak | 2023/11/25 01:20 | Takuya Kumasaka v Jeamoon Lee | 7-6,6-0 |
| ITF M15 Ipoh Perak | 2023/11/24 02:00 | Takuya Kumasaka v Hayato Matsuoka | 7-6,6-0 |
| ITF M15 Ipoh Perak | 2023/11/23 04:55 | Hikaru Shiraishi v Takuya Kumasaka | 6-7,4-6 |
| ITF M15 Ipoh Perak | 2023/11/22 02:30 | Yeongseok Jeong v Takuya Kumasaka | 6-3,6-7,3-6 |
| ITF M15 Kuching | 2023/11/16 04:05 | Takuya Kumasaka v Kokoro Isomura | 3-6,6-3,6-7 |
| ITF M15 Kuching | 2023/11/15 02:00 | David Pichler v Takuya Kumasaka | 4-6,3-6 |
| ITF M25 Sapporo | 2023/09/12 05:40 | Takuya Kumasaka v Koki Matsuda | 0-6,2-6 |