Stadium: Court 1 Round: 27
| ITF Vietnam F2 | 2018/05/09 03:00 | Nitin Kumar Sinha v Kazuki Nishiwaki | 4-6,1-6 |
| ITF M15 Anning | 2019/01/10 03:00 | Taisei Ichikawa v Kazuki Nishiwaki | 5-7,3-6 |
| ITF M15 Anning | 2019/01/08 04:20 | Kazuki Nishiwaki v Tianjia Guo | 6-1,6-1 |
| ITF M15 Anning | 2019/01/03 05:30 | Eric Vanshelboim v Kazuki Nishiwaki | 4-6,6-1,6-4 |
| ITF M15 Anning | 2019/01/02 04:25 | Rui-Xuan Wang v Kazuki Nishiwaki | 6-1,2-6,4-6 |
| Challenger Kobe | 2018/11/10 06:00 | Xin Gao v Kazuki Nishiwaki | 6-4,6-4 |
| ITF Australia F8 | 2018/10/10 01:00 | Colin Sinclair v Kazuki Nishiwaki | 6-7,6-4,6-4 |
| ITF Australia F7 | 2018/10/04 00:00 | Colin Sinclair v Kazuki Nishiwaki | 6-3,6-3 |
| ITF Australia F7 | 2018/10/02 01:45 | Connor Johnson v Kazuki Nishiwaki | 3-6,3-6 |
| ITF M15 Anning | 2019/01/10 07:15 | Li-Wei Tan v Nitin Kumar Sinha | 6-3,5-7,4-6 |
| ITF M15 Anning | 2019/01/08 02:30 | Nitin Kumar Sinha v Hong Kit Wong | 6-4,6-1 |
| ITF M15 Anning | 2019/01/03 03:55 | Jung-Woong Na v Nitin Kumar Sinha | 6-4,6-4 |
| ITF M15 Anning | 2019/01/01 03:30 | Nitin Kumar Sinha v Soichiro Moritani | 6-1,6-7,6-3 |
| Challenger Pune | 2018/11/17 06:00 | Nitin Kumar Sinha v Youssef Hossam | 3-6,4-6 |
| Challenger Bangalore | 2018/11/10 10:35 | Nitin Kumar Sinha v Lucas Gerch | 3-6,4-6 |
| ITF Thailand F8 | 2018/11/04 04:30 | Vladislav Dubinsky v Nitin Kumar Sinha | 6-4,6-3 |
| ITF Vietnam F5 | 2018/10/30 03:00 | Robert Strombachs v Nitin Kumar Sinha | 6-1,6-4 |