Round: 26 Ground: Synthetic outdoor
| ITF Japan F7 | 2016/06/07 01:00 | Ryotaro Matsumura v Nagao, Katsuki | 4-6,4-6 |
| ITF Japan F6 | 2016/05/31 01:00 | Katayama, Sho v Nagao, Katsuki | 3-6,6-4,6-3 |
| ITF Guam F1 | 2016/05/23 00:00 | Nagao, Katsuki v Kibi, Yuya | 6-7,4-6 |
| ITF Turkey F19 | 2016/05/11 09:40 | Nagao, Katsuki v Fernando Yamacita | 1-6,1-6 |
| ITF Turkey F18 | 2016/05/06 08:00 | Nagao, Katsuki v Sieber, Marc | 3-6,6-4,2-6 |
| ITF Turkey F18 | 2016/05/03 11:50 | Niesten, Miliaan v Nagao, Katsuki | 4-6,3-6 |
| Turkey F17, Singles Qualifying | 2016/04/26 11:20 | Nagao, Katsuki v Sieber, Marc | 2-6,1-6 |
| ITF Japan F5 | 2016/04/05 07:45 | Oku, Hiromasa v Nagao, Katsuki | 7-6,5-7,6-1 |
| ITF Japan F7 | 2016/06/06 02:50 | Issei Okamura v Takeuchi, Kento (1987) | 2-6,3-6 |
| ITF Japan F6 | 2016/06/01 01:00 | Takeuchi, Kento (1987) v Ito, Yuichi | 4-6,3-6 |
| ITF Japan F6 | 2016/05/31 04:25 | Takeuchi, Kento (1987) v Ryota Tanuma | 6-3,3-6,6-2 |
| ITF China F8 | 2016/05/24 06:35 | Takeuchi, Kento (1987) v Bourchier, Harry | 6-7,4-6 |
| ITF China F5 | 2016/04/12 02:00 | Takeuchi, Kento (1987) v Rigele Te | 1-6,1-6 |
| ITF Japan F5 | 2016/04/08 02:30 | Yosuke Watanuki v Takeuchi, Kento (1987) | 6-1,6-2 |
| ITF Japan F5 | 2016/04/05 02:00 | Nam Hoang Ly v Takeuchi, Kento (1987) | 4-6,6-7 |
| ITF Japan F4 | 2016/03/31 01:00 | Shintaro Imai v Takeuchi, Kento (1987) | 6-1,6-3 |