Stadium: Centre Court Round: 25 Ground: Hardcourt outdoor
| Challenger Shanghai | 2019/09/10 02:30 | Kazuki Nishiwaki v Jumpei Yamasaki | 3-6,2-6 |
| 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 |
| Challenger Kaohsiung | 2019/09/16 03:15 | Rio Noguchi v Lo, Chien Hsun | 6-2,6-2 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/09/04 05:20 | Sidharth Rawat v Lo, Chien Hsun | 6-2,6-3 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/09/03 08:45 | Lo, Chien Hsun v Noikor, Noppadol | 6-1,6-1 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/09/02 04:25 | Lo, Chien Hsun v Mulada, Tonkla | 6-0,6-0 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/08/28 03:00 | Saito, Takashi v Lo, Chien Hsun | 6-1,6-1 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/14 04:35 | Lo, Chien Hsun v Ajeet Rai | 2-6,2-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/08 02:30 | Gray, Jonathan v Lo, Chien Hsun | 6-2,6-0 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2019/08/07 03:50 | Addison, Aaron v Lo, Chien Hsun | 6-7,4-6 |