Round: 25 Ground: Hardcourt outdoor
| ITF China F7 | 2017/05/19 06:25 | Naoki Nakagawa v Chuhan Wang | 6-7,6-4,2-6 |
| ITF China F7 | 2017/05/18 02:00 | Zhe Li v Naoki Nakagawa | 6-3,3-6,4-6 |
| ITF China F7 | 2017/05/16 07:40 | Thomas Fancutt v Naoki Nakagawa | 6-3,6-7,4-6 |
| ITF USA F16 | 2017/05/03 15:50 | Isaiah Strode v Naoki Nakagawa | 6-3,6-3 |
| ITF USA F15 | 2017/04/25 15:00 | Lukas Ollert v Naoki Nakagawa | 7-6,6-3 |
| ITF USA F14 | 2017/04/19 14:00 | Naoki Nakagawa v Cameron Silverman | 5-7,6-4,2-6 |
| ITF Italy F7 | 2017/04/05 17:15 | Salvatore Caruso v Naoki Nakagawa | 6-1,7-5 |
| ITF Italy F7 | 2017/04/04 10:30 | Walter Trusendi v Naoki Nakagawa | 3-6,6-2,3-6 |
| Challenger Busan Qual | 2017/05/15 03:25 | Takuto Niki v Edward Corrie | 4-6,6-4,4-6 |
| Challenger Busan Qual | 2017/05/14 03:50 | Takuto Niki v Seong-Gook Oh | 6-4,6-3 |
| Challenger Seoul Qual | 2017/05/06 02:20 | Daniel Nguyen v Takuto Niki | 2-6,6-1,6-2 |
| Challenger Gimcheon Qual | 2017/05/01 02:00 | Takuto Niki v Hubert Hurkacz | 3-6,4-6 |
| Challenger Gimcheon Qual | 2017/04/30 03:45 | Takuto Niki v Ki Su Jung | 6-1,6-2 |
| Challenger Gimcheon Qual | 2017/04/29 05:10 | Takuto Niki v Hiroyasu Ehara | 6-1,6-4 |
| ITF Japan F5 | 2017/04/07 04:31 | Masato Shiga v Takuto Niki | 6-2,0-6,6-4 |
| ITF Japan F5 | 2017/04/07 04:30 | Masato Shiga v Takuto Niki | 6-2,0-6,6-4 |