Round: 25 Ground: Clay
| ITF Korea F8 | 2016/08/23 04:15 | Jae Hwan Kim v Katsuki Nagao | 6-3,6-2 |
| ITF Japan F8 | 2016/06/16 01:00 | Yuki Mochizuki v Katsuki Nagao | 6-1,6-0 |
| ITF Japan F8 | 2016/06/14 03:00 | Katsuki Nagao v Yuichi Ito | 6-2,6-4 |
| ITF Japan F7 | 2016/06/08 01:00 | Katsuki Nagao v Kento Takeuchi | 4-6,1-6 |
| ITF Japan F7 | 2016/06/07 01:00 | Ryotaro Matsumura v Katsuki Nagao | 4-6,4-6 |
| ITF Japan F6 | 2016/05/31 01:00 | Sho Katayama v Katsuki Nagao | 3-6,6-4,6-3 |
| ITF Guam F1 | 2016/05/23 00:00 | Katsuki Nagao v Yuya Kibi | 6-7,4-6 |
| ITF Turkey F19 | 2016/05/11 09:40 | Katsuki Nagao v Fernando Yamacita | 1-6,1-6 |
| ITF Korea F8 | 2016/08/29 01:30 | Jae-Won Choi v Chan-Yeong Oh | 6-3,6-1 |
| ITF Korea F1 Qual | 2016/06/13 04:50 | Jae-Won Choi v Jeamoon Lee | 7-6,3-6,2-6 |
| ITF Korea F1 Qual | 2016/06/12 03:00 | Jae-Won Choi v Jin Sung Han | 6-1,6-3 |
| ITF Korea F1 Qual | 2016/06/11 01:00 | Jae-Won Choi v Yu-Seob Kim | 6-2,6-3 |
| ITF Korea F1 | 2015/05/17 02:00 | Jung-Woong Na v Jae-Won Choi | 6-1,6-3 |