| ITF Japan F7 | 2015/06/18 02:00 | 田沼 諒太 v Nagao, Katsuki | 6-3,6-1 |
| ITF Japan F7 | 2015/06/17 01:00 | タケシマ,シュンロウ v Nagao, Katsuki | 6-7,3-6 |
| ITF Japan F6 | 2015/06/10 01:30 | 綿貫 陽介 v Nagao, Katsuki | 7-6,6-7,6-4 |
| ITF Japan F5 | 2015/06/02 01:00 | Mclachlan, Ben v Nagao, Katsuki | 6-1,6-2 |
| ITF Guam F1 | 2015/05/30 02:20 | Suzuki, Takao v Nagao, Katsuki | 2-6,6-4,6-2 |
| ITF Guam F1 | 2015/05/29 01:40 | Nagao, Katsuki v Moore, B. | 2-6,6-4,6-2 |
| ITF Guam F1 | 2015/05/25 01:00 | Nagao, Katsuki v Sadler, Olly | 6-4,6-4 |
| ITF Thailand F9 | 2015/04/25 04:00 | Nagao, Katsuki v Itzstein, Zach | 5-7,3-6 |
| ITF Japan F7 Qual | 2015/06/15 00:30 | Sano, Koichi v Osafune, Masaki | 6-4,6-2 |
| ITF Japan F7 Qual | 2015/06/14 00:00 | Osafune, Masaki v Sebaoun, Leo Julien | 7-5,6-2 |
| ITF Japan F3 | 2015/03/22 01:00 | Osafune, Masaki v イ・ジェムン | 4-6,3-6 |
| ITF Japan F7 Qual | 2014/06/16 01:00 | Osafune, Masaki v 徳田 廉大 | 4-6,3-6 |
| ITF Japan F1 | 2014/03/11 02:55 | Onozawa, Arata v Osafune, Masaki | 4-6,6-1,6-3 |