Ground: Hardcourt outdoor
| ITF Thailandia F9 | 2015/04/18 04:00 | Katsuki Nagao v Jatuporn Nalamphun | 6-0,6-2 |
| ITF Giappone F3 | 2015/03/22 01:00 | Yuki Nakamura v Katsuki Nagao | 7-6,6-0 |
| ITF Giappone F2 | 2015/03/18 02:55 | Duckhee Lee v Katsuki Nagao | 6-3,7-5 |
| ITF Giappone F2 | 2015/03/16 01:00 | Chih-Jen Ho v Katsuki Nagao | 4-6,4-6 |
| ITF Giappone F1 | 2015/03/10 03:50 | Katsuki Nagao v Duckhee Lee | 2-6,3-6 |
| ITF Turchia F34 | 2014/10/01 08:35 | Marshall Tutu v Katsuki Nagao | 6-3,6-1 |
| ITF Turchia F34 | 2014/09/29 07:00 | Katsuki Nagao v Yvo Panak | 6-3,6-0 |
| ITF Turchia F34 | 2014/09/28 07:00 | Katsuki Nagao v Keisuke Watanuki | 6-3,5-7,7-6 |
| ITF Thailandia F9 | 2015/04/18 04:00 | Sonchat Ratiwatana v Syed Mohd Agil Syed Naguib | 6-3,6-1 |
| ITF Giappone F4 | 2015/03/29 00:00 | Jarryd Chaplin v Sonchat Ratiwatana | 5-7,6-3,6-2 |