Round: 27 Ground: Hardcourt outdoor
| ITF Hong Kong F1 | 2017/06/21 07:00 | Ye Cong Mo v Katsuki Nagao | 2-6,4-6 |
| ITF Japan F8 | 2017/06/15 03:30 | Gengo Kikuchi v Katsuki Nagao | 6-2,6-2 |
| ITF Japan F8 | 2017/06/14 03:00 | Katsuki Nagao v Taisei Ichikawa | 6-0,6-1 |
| ITF Japan F7 | 2017/06/03 01:00 | Katsuki Nagao v Rimpei Kawakami | 6-7,6-7 |
| ITF Japan F5 | 2017/04/04 04:40 | Tatsuma Ito v Katsuki Nagao | 7-6,6-4 |
| ITF Japan F5 | 2017/04/01 02:00 | Katsuki Nagao v Kazuki Shimizu | 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 Hong Kong F1 | 2017/06/21 10:20 | Eric James Johnson v Jumpei Yamasaki | 3-6,3-6 |
| ITF Hong Kong F1 | 2017/06/20 10:35 | Hei Yin Andrew Li v Jumpei Yamasaki | 4-6,1-6 |
| ITF Qatar F2 | 2017/04/11 12:00 | Daniel Altmaier v Jumpei Yamasaki | 6-1,6-3 |
| ITF Japan F4 | 2017/03/30 01:00 | Kaito Uesugi v Jumpei Yamasaki | 6-2,6-2 |
| ITF Japan F4 | 2017/03/28 03:00 | Yusuke Watanuki v Jumpei Yamasaki | 7-6,4-6,6-7 |
| ITF Japan F3 | 2017/03/22 04:45 | Jumpei Yamasaki v Jeamoon Lee | 6-7,3-6 |
| ITF Japan F3 | 2017/03/20 01:00 | Renta Tokuda v Jumpei Yamasaki | 3-6,6-1,3-6 |
| ITF Japan F2 | 2017/03/14 02:30 | Jumpei Yamasaki v Jeamoon Lee | 1-6,3-6 |