Round: 62 Ground: Hardcourt outdoor
| ITF Japan F8 | 2015/06/24 01:10 | Nagao, Katsuki v Osafune, Masaki | 6-3,6-0 |
| ITF Japan F3 | 2016/03/20 01:00 | 이토, 유야 v Nagao, Katsuki | 6-3,6-4 |
| ITF Japan F3 | 2016/03/19 03:45 | Kishi, Ryota v Nagao, Katsuki | 1-6,5-7 |
| ITF Japan F2 | 2016/03/15 01:00 | Nagao, Katsuki v Kondo, Hiroki | 6-7,0-6 |
| ITF Japan F2 | 2016/03/13 01:00 | Nagao, Katsuki v 오노다, 켄 | 6-3,5-7,6-4 |
| ITF Japan F1 | 2016/03/10 02:45 | Nagao, Katsuki v 와타누키, 유스케 | 1-6,6-2,1-6 |
| ITF Japan F1 | 2016/03/07 01:00 | Nagao, Katsuki v 모리타니, 소이치로 | 6-4,7-6 |
| ITF Japan F1 | 2016/03/05 01:00 | Nagao, Katsuki v 코바야시, 마사야 | 6-2,2-6,6-3 |
| ITF Japan F8 | 2015/06/27 01:00 | 우치야마, 야스타카 v Nagao, Katsuki | 7-6,6-3 |
| ITF Dominican Republic F2 | 2015/12/06 14:00 | Aguilar, Juan Carlos v Osafune, Masaki | 7-5,6-3 |
| ITF Dominican Republic F2 | 2015/12/05 13:30 | Mcdaniels, Mitchell Thomas v Osafune, Masaki | 4-6,6-7 |
| ITF Dominican Republic F1 | 2015/11/28 16:00 | 베르그, 코놀 v Osafune, Masaki | 6-2,3-6,7-6 |
| ITF Turkey F41 | 2015/10/13 07:00 | 셈잔, 마레크 v Osafune, Masaki | 7-6,2-6,7-6 |
| ITF Turkey F36 | 2015/10/05 07:00 | 리, 위안펑 v Osafune, Masaki | 7-5,6-0 |
| ITF Turkey F36 | 2015/10/04 12:00 | Osafune, Masaki v Anagnastopol, Victor | 7-5,6-0 |
| ITF China F11 Qual | 2015/07/20 02:00 | Wachiramanowong, Kittiphong v Osafune, Masaki | 6-0,6-1 |
| ITF China F11 Qual | 2015/07/19 02:00 | Osafune, Masaki v Chen, Long | 6-4,4-6,7-6 |