Round: 25 Ground: Clay
| 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 | Jeamoon Lee v Katsuki Nagao | 7-6,6-4 |
| ITF Japan F3 | 2017/03/18 08:00 | Masamichi Imamura v Katsuki Nagao | 2-6,1-6 |
| ITF Japan F3 | 2017/03/18 05:00 | Ryohei Tagata v Katsuki Nagao | 3-6,3-6 |
| ITF Japan F1 | 2017/03/06 01:00 | Katsuki Nagao v Sho Shimabukuro | 3-6,6-7 |
| ITF Japan F1 | 2017/03/05 01:00 | Katsuki Nagao v Yuichiro Inui | 6-3,6-2 |
| ITF Japan F1 | 2017/03/04 03:30 | Katsuki Nagao v Leo Julien Sebaoun | 2-6,6-3,6-3 |