Ground: Hardcourt outdoor
| ITF Thailand F9 | 2015/04/20 04:00 | Nagao, Katsuki v Takeshima, Shunrou | 4-6,5-7 |
| ITF Thailand F9 | 2015/04/19 03:00 | Nagao, Katsuki v Ratiwatana, Sonchat | 6-3,6-3 |
| ITF Thailand F9 | 2015/04/18 04:00 | Nagao, Katsuki v Nalamphun, Jatuporn | 6-0,6-2 |
| ITF Japan F3 | 2015/03/22 01:00 | Nakamura, Yuki v Nagao, Katsuki | 7-6,6-0 |
| ITF Japan F2 | 2015/03/18 02:55 | Duckhee Lee v Nagao, Katsuki | 6-3,7-5 |
| ITF Japan F2 | 2015/03/16 01:00 | Ho, Chih-Jen v Nagao, Katsuki | 4-6,4-6 |
| ITF Japan F1 | 2015/03/10 03:50 | Nagao, Katsuki v Duckhee Lee | 2-6,3-6 |
| ITF Turkey F34 | 2014/10/01 08:35 | Marshall Tutu v Nagao, Katsuki | 6-3,6-1 |
| ITF Thailand F9 | 2015/04/21 05:50 | Isarow, Pruchya v Itzstein, Zach | 6-3,6-3 |
| ITF Thailand F9 | 2015/04/19 05:00 | Itzstein, Zach v Kawin, Patcharapol | 7-6,6-1 |
| ITF Thailand F9 | 2015/04/18 07:30 | Patrombon, Jeson v Itzstein, Zach | 6-7,2-6 |
| ITF Indonesia F3 | 2015/04/15 03:00 | Itzstein, Zach v Rungkat, Christopher | 4-6,4-6 |
| ITF Indonesia F3 Qual | 2015/04/12 04:30 | Itzstein, Zach v Hamzah, Ekky | 6-2,7-5 |