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