Stadium: Court 5 Round: 24 Ground: Hardcourt outdoor
| Challenger Shanghai | 2019/09/09 02:00 | Kazuki Nishiwaki v Balaji, N. Sriram | 6-4,6-3 |
| ITF M15 Cancun | 2019/08/20 20:20 | Olivares, Jose v Kazuki Nishiwaki | 6-3,3-6,6-0 |
| Challenger Yokkaichi | 2019/08/07 02:00 | Kazuki Nishiwaki v Yusuke Takahashi | 5-7,6-3,3-6 |
| Challenger Yokkaichi | 2019/08/06 01:00 | Courtney John Lock v Kazuki Nishiwaki | 2-6,2-6 |
| Singapore, Singles Qualifying M-ITF-SGP-01A | 2019/06/15 03:00 | Gray, Jonathan v Kazuki Nishiwaki | 6-3,7-5 |
| Singapore, Singles Qualifying M-ITF-SGP-01A | 2019/06/14 05:30 | Kazuki Nishiwaki v Nkomba, Benard Bruno | 6-3,6-0 |
| Singapore, Singles Qualifying M-ITF-SGP-01A | 2019/06/13 02:00 | Kazuki Nishiwaki v Abhinav Sanjeev Shanmugam | 7-6,6-2 |
| Singapore, Singles Qualifying M-ITF-SGP-01A | 2019/06/11 07:45 | Kazuki Nishiwaki v Mohd Adam Das, Shamirul Shahril | 6-0,6-1 |
| Baotou, Chine | 2019/08/28 07:35 | Jumpei Yamasaki v Mukund Sasikumar | 0-6,2-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/25 02:30 | Boyer, Dusty H v Jumpei Yamasaki | 3-6,1-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/24 03:00 | Jumpei Yamasaki v Purcell, Rhett | 6-3,7-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/23 02:30 | Schmid, Aaron v Jumpei Yamasaki | 6-7,5-7 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/22 02:30 | Yeung, Pak Long v Jumpei Yamasaki | 3-6,3-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/20 05:25 | Anand, Kunal v Jumpei Yamasaki | 3-6,2-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/15 02:30 | Jumpei Yamasaki v Niki Kaliyanda Poonacha | 4-6,7-6,5-7 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/13 06:20 | Jumpei Yamasaki v Nguyen, Phuong van | 6-2,6-4 |