Stadium: Court 1 Round: 26 Ground: Clay
| Challenger Gimcheon Qual | 2017/04/29 05:10 | Takuto Niki v Hiroyasu Ehara | 6-1,6-4 |
| ITF Japan F1 | 2017/03/11 01:00 | Hiroyasu Ehara v Takuto Niki | 2-6,1-6 |
| Challenger Yokohama Qual | 2017/02/26 03:20 | Hiroyasu Ehara v Takuto Niki | 7-6,1-6,3-6 |
| ITF Japan F3 | 2015/03/26 03:45 | Hiroyasu Ehara v Takuto Niki | 6-4,3-6,3-6 |
| ITF Japan F2 | 2015/03/21 03:20 | Takuto Niki v Hiroyasu Ehara | 6-3,6-7,6-2 |
| Challenger Hua Hin Qual | 2017/11/18 05:45 | Edward Bourchier v Takuto Niki | 6-3,6-4 |
| Challenger Toyota Qual | 2017/11/11 05:25 | Jackson Withrow v Takuto Niki | 7-5,7-6 |
| Challenger Kobe Qual | 2017/11/06 03:40 | Lucas Miedler v Takuto Niki | 4-6,6-3,6-3 |
| Challenger Kobe Qual | 2017/11/05 05:40 | Takuto Niki v Shintaro Imai | 6-3,6-4 |
| Challenger Kobe Qual | 2017/11/04 06:30 | Issei Okamura v Takuto Niki | 6-3,2-6,2-6 |
| ATP Chengdu Qual | 2017/09/23 08:10 | Takuto Niki v Marcos Giron | 2-6,5-7 |
| Challenger Gwangju | 2017/09/19 03:15 | Soonwoo Kwon v Takuto Niki | 6-4,6-1 |
| Challenger Shanghai | 2017/09/12 02:00 | Zihao Xia v Takuto Niki | 2-6,7-6,6-1 |
| Challenger Toyota | 2017/11/16 08:00 | Hiroyasu Ehara v Tatsuma Ito | 2-6,1-6 |
| Challenger Toyota | 2017/11/14 02:50 | Kento Takeuchi v Hiroyasu Ehara | 4-6,4-6 |
| Challenger Toyota Qual | 2017/11/12 07:05 | Hiroyasu Ehara v Toshihide Matsui | 6-4,7-6 |
| Challenger Toyota Qual | 2017/11/11 07:35 | Hiroyasu Ehara v Yuto Sakai | 6-7,6-2,6-3 |
| ITF Thailand F8 | 2017/10/10 07:50 | Hiroyasu Ehara v Nam Hoang Ly | 0-6,5-7 |
| ITF Thailand F7 | 2017/10/03 09:50 | Remy Bertola v Hiroyasu Ehara | 6-2,6-4 |
| ITF Switzerland F5 | 2017/09/03 12:20 | Hiroyasu Ehara v Marc-Andrea Huesler | 4-6,6-4,6-2 |
| ITF Switzerland F5 | 2017/09/02 11:15 | Matteo Viola v Hiroyasu Ehara | 5-7,7-5,6-7 |