Round: 25 Ground: Clay
| ITF Japan F7 | 2017/06/03 01:00 | Nagao, Katsuki v Kawakami, Rimpei | 6-7,6-7 |
| ITF Japan F5 | 2017/04/04 04:40 | Tatsuma Ito v Nagao, Katsuki | 7-6,6-4 |
| ITF Japan F5 | 2017/04/01 02:00 | Nagao, Katsuki v Shimizu, Kazuki | 6-3,6-3 |
| ITF Japan F4 | 2017/03/28 01:00 | Nagao, Katsuki v Takeshima, Shunrou | 2-6,2-6 |
| ITF Japan F4 | 2017/03/26 00:59 | Nagao, Katsuki v Hatakeyama, Nasa | 6-2,6-3 |
| ITF Japan F4 | 2017/03/25 01:00 | Nagao, Katsuki v Tagata, Ryohei | 2-6,6-2,6-0 |
| ITF Japan F3 | 2017/03/19 01:00 | Jeamoon Lee v Nagao, Katsuki | 7-6,6-4 |
| ITF Japan F3 | 2017/03/18 08:00 | Masamichi Imamura v Nagao, Katsuki | 2-6,1-6 |
| ITF Japan F8 | 2017/06/11 00:00 | Kazuma Kawachi v Taisei Ichikawa | 6-2,5-7,2-6 |
| ITF Japan F8 | 2017/06/10 00:00 | Kousuke Ogura v Taisei Ichikawa | 2-6,2-6 |