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