Stadium: Court 4 Round: 27 Ground: Hardcourt outdoor
| Challenger Yokkaichi | 2019/08/07 02:00 | Kazuki Nishiwaki v Yusuke Takahashi | 5-7,6-3,3-6 |
| ITF M25 Tay Ninh | 2019/10/03 02:00 | Yusuke Takahashi v Naoki Nakagawa | 6-4,6-3 |
| ITF M25 Tay Ninh | 2019/10/01 03:30 | Yusuke Takahashi v Linh Giang Trinh | 6-1,6-4 |
| Challenger Kaohsiung | 2019/09/17 03:45 | Bourchier, Harry v Yusuke Takahashi | 3-6,6-1,6-2 |
| Challenger Kaohsiung | 2019/09/16 01:30 | Yusuke Takahashi v Kuan-Yi Lee | 6-4,6-2 |
| Challenger Shanghai | 2019/09/11 04:15 | Kaichi Uchida v Yusuke Takahashi | 4-6,7-6,6-0 |
| Challenger Shanghai | 2019/09/10 02:30 | Wang, Chuhan v Yusuke Takahashi | 4-6,4-6 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/09/07 03:00 | Makoto Ochi v Yusuke Takahashi | 6-2,4-6,6-1 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/09/06 03:00 | Saito, Takashi v Yusuke Takahashi | 2-6,2-6 |
| ITF M25 Tay Ninh | 2019/10/03 02:00 | Kazuki Nishiwaki v Liu, Shao-Fan | 4-6,6-2,6-3 |
| ITF M25 Tay Ninh | 2019/10/01 05:55 | Kazuki Nishiwaki v Lo, Chien Hsun | 6-3,6-4 |
| 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 |