Round: 25 Ground: Clay
| ITF Japan F7 | 2017/06/03 01:00 | Katsuki Nagao v Римпеи Каваками | 6-7,6-7 |
| ITF Japan F5 | 2017/04/04 04:40 | Татсума Ито v Katsuki Nagao | 7-6,6-4 |
| ITF Japan F5 | 2017/04/01 02:00 | Katsuki Nagao v Казуки Шимицу | 6-3,6-3 |
| ITF Japan F4 | 2017/03/28 01:00 | Katsuki Nagao v Shunrou Takeshima | 2-6,2-6 |
| ITF Japan F4 | 2017/03/26 00:59 | Katsuki Nagao v Nasa Hatakeyama | 6-2,6-3 |
| ITF Japan F4 | 2017/03/25 01:00 | Katsuki Nagao v Ryohei Tagata | 2-6,6-2,6-0 |
| ITF Japan F3 | 2017/03/19 01:00 | Лий Джеа-мун v Katsuki Nagao | 7-6,6-4 |
| ITF Japan F3 | 2017/03/18 08:00 | Масамичи Имамура v Katsuki Nagao | 2-6,1-6 |
| ITF Japan F8 | 2017/06/11 00:00 | Казума Кавачи v Тайсей Ичикауа | 6-2,5-7,2-6 |
| ITF Japan F8 | 2017/06/10 00:00 | Коусуке Огура v Тайсей Ичикауа | 2-6,2-6 |