Round: 62 Ground: Hardcourt outdoor
| ITF Japan F1 | 2017/03/04 03:30 | Nagao, Katsuki v Sebaoun, Leo Julien | 2-6,6-3,6-3 |
| ITF Korea F8 | 2016/09/06 04:00 | Nagao, Katsuki v Numajiri, Keisuke | 6-3,4-6,0-6 |
| ITF Korea F7 | 2016/08/31 04:35 | Makoto Ochi v Nagao, Katsuki | 6-3,6-2 |
| ITF Korea F7 | 2016/08/30 01:30 | Nagao, Katsuki v Choi, Jae-Won | 6-3,7-6 |
| ITF Korea F8 | 2016/08/23 04:15 | Jae Hwan Kim v Nagao, Katsuki | 6-3,6-2 |
| ITF Japan F8 | 2016/06/16 01:00 | Yuki Mochizuki v Nagao, Katsuki | 6-1,6-0 |
| ITF Japan F8 | 2016/06/14 03:00 | Nagao, Katsuki v Ito, Yuichi | 6-2,6-4 |
| ITF Japan F7 | 2016/06/08 01:00 | Nagao, Katsuki v Takeuchi, Kento (1987) | 4-6,1-6 |
| ITF Kuwait F3 | 2016/11/14 23:00 | Samaha, Giovani v Yuichiro Inui | 6-3,6-7,7-6 |
| Kuwait F3, Singles Qualifying | 2016/11/12 23:00 | Linge, Thomas v Yuichiro Inui | 2-6,1-6 |
| Kuwait F3, Singles Qualifying | 2016/11/12 08:33 | Redha, Abdulaziz v Yuichiro Inui | 5-7,0-6 |
| Kuwait F3, Singles Qualifying | 2016/11/11 23:00 | Redha, Abdulaziz v Yuichiro Inui | 5-7,0-6 |
| ITF Kuwait F1 | 2016/11/04 23:00 | Zawisza, Pawel v Yuichiro Inui | 7-6,4-6,6-0 |
| ITF Chinese Taipei F3 | 2016/10/24 02:00 | Lo, Chien Hsun v Yuichiro Inui | 6-3,7-6 |
| ITF Chinese Taipei F2 | 2016/10/17 02:00 | Tan, Li-Wie v Yuichiro Inui | 6-4,6-2 |
| ITF Chinese Taipei F1 | 2016/10/09 03:00 | Tsung-Hao Huang v Yuichiro Inui | 7-5,6-2 |