Stadium: Court 7 Round: 26 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/12 07:10 | Sanhui Shin v Kousuke Ogura | 7-5,4-6,6-7 |
| ITF M25 Sapporo | 2023/09/05 02:00 | Jumpei Yamasaki v Kousuke Ogura | 6-4,6-4 |
| Challenger Lima | 2023/08/20 18:20 | Sebastian Rodriguez v Kousuke Ogura | 6-4,7-5 |
| Challenger Santo Domingo | 2023/08/07 21:00 | Jorge Panta v Kousuke Ogura | 4-6,6-1,6-2 |
| ITF M15 Pittsburgh | 2023/07/27 15:00 | Kousuke Ogura v Felix Corwin | 6-2,5-7,1-6 |
| ITF M15 Pittsburgh | 2023/07/25 16:00 | Kousuke Ogura v Enrique Pena | 7-5,6-3 |
| ITF M15 Rochester | 2023/07/21 18:50 | Tyler Stice v Kousuke Ogura | 6-1,6-3 |
| ITF M15 Rochester | 2023/07/20 22:15 | Juan Sebastian Osorio v Kousuke Ogura | 3-6,1-6 |
| ITF M25 Sapporo | 2023/09/13 04:00 | Kazuki Nishiwaki v Taki Adachi | 6-1,6-2 |
| ITF M25 Hong Kong | 2023/09/09 10:00 | Kazuki Nishiwaki v Coleman Wong | 2-6,7-5,8-10 |
| ITF M25 Hong Kong | 2023/09/07 07:00 | Jie Cui v Kazuki Nishiwaki | 5-7,4-6 |
| ITF M25 Hong Kong | 2023/09/06 02:00 | Collin Altamirano v Kazuki Nishiwaki | 3-6,5-7 |
| ITF M25 Tainan | 2023/08/26 02:00 | Kazuki Nishiwaki v Rishab Agarwal | 5-7,3-6 |
| ITF M25 Tainan | 2023/08/25 02:00 | Kazuki Nishiwaki v Yamato Sueoka | 6-2,6-3 |
| ITF M25 Tainan | 2023/08/24 05:20 | Henrik Wiersholm v Kazuki Nishiwaki | 3-6,6-3,1-6 |
| ITF M25 Tainan | 2023/08/22 04:15 | Tzu Li Chang v Kazuki Nishiwaki | 1-6,3-6 |