Stadium: Court E Round: 25 Ground: Hardcourt outdoor
| Challenger Yokohama | 2019/02/25 02:45 | Luke Saville v Kaito Uesugi | 2-6,6-4,6-2 |
| Challenger Chennai | 2019/02/05 06:30 | Kaito Uesugi v Collin Altamirano | 6-1,3-6,6-7 |
| Challenger Chennai | 2019/02/04 04:30 | Kaito Uesugi v Dhakshineswar Suresh | 6-1,6-3 |
| Challenger Da Nang | 2019/01/07 03:00 | Kaito Uesugi v Arthur Rinderknech | 3-6,4-6 |
| Challenger Da Nang | 2019/01/06 03:30 | Alafia Ayeni v Kaito Uesugi | 6-7,6-2,3-6 |
| Challenger Kobe | 2018/11/12 04:55 | Go Soeda v Kaito Uesugi | 6-3,6-1 |
| Challenger Ningbo | 2018/10/14 04:05 | Yuta Shimizu v Kaito Uesugi | 3-6,6-2,6-1 |
| Challenger Ningbo | 2018/10/13 04:30 | Miliaan Niesten v Kaito Uesugi | 5-7,4-6 |
| ITF M15 Sharm El Sheikh | 2019/02/18 12:15 | Kazuki Nishiwaki v Giorgio Ricca | 7-5,6-7,6-10 |
| ITF M15 Sharm El Sheikh | 2019/02/18 07:30 | Kazuki Nishiwaki v Mathys Erhard | 6-0,6-1 |
| ITF M15 Anning | 2019/01/12 05:05 | Kazuki Nishiwaki v Agustin Velotti | 6-7,2-6 |
| ITF M15 Anning | 2019/01/11 04:40 | Kazuki Nishiwaki v Nitin Kumar Sinha | 6-7,6-2,6-4 |
| 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 |