Stadium: Court 4 Round: 27 Ground: Hardcourt outdoor
| Hong Kong, Simples M-ITF-HKG-04A | 2023/09/06 02:00 | Collin Altamirano v Kazuki Nishiwaki | 3-6,5-7 |
| ITF Singapore F2 | 2018/05/25 03:00 | Kazuki Nishiwaki v Collin Altamirano | 7-5,2-6,3-6 |
| 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 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/17 01:55 | Naoki Nakagawa v Kazuki Nishiwaki | 4-6,6-1,6-4 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/16 05:30 | Sekiguchi, Shuichi v Kazuki Nishiwaki | 6-0,5-7,4-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/16 01:00 | Kazuki Nishiwaki v Yuki Mochizuki | 6-1,6-3 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/15 03:20 | Kousuke Ogura v Kazuki Nishiwaki | 4-6,7-5,2-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/13 04:00 | Kazuki Nishiwaki v Taki Adachi | 6-1,6-2 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/09/09 10:00 | Kazuki Nishiwaki v Coleman Wong | 2-6,7-5,8-10 |
| ITF M25 Takasaki | 2023/09/21 03:50 | Collin Altamirano v Ehara, Hiroyasu | 6-4,6-1 |
| ITF M25 Takasaki | 2023/09/20 04:00 | Hayato Matsuoka v Collin Altamirano | 7-5,4-6,2-6 |
| ITF M25 Takasaki | 2023/09/18 03:10 | Collin Altamirano v Shunsuke Nakagawa | 6-3,6-2 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/13 03:05 | Collin Altamirano v Yuki Mochizuki | 6-7,4-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/11 03:20 | Yuta Tomida v Collin Altamirano | 3-6,5-7 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/09/06 02:00 | Collin Altamirano v Kazuki Nishiwaki | 3-6,5-7 |
| ITF M25 Hong Kong Qual | 2023/09/04 02:00 | Collin Altamirano v Ren Nakamura | 6-4,6-1 |
| ITF M25 Hong Kong Qual | 2023/09/03 02:00 | Collin Altamirano v Yue, Ching Ho Sunny | 6-0,6-2 |