Stadium: Court F Round: 25 Ground: Hardcourt outdoor
| Challenger Yokohama Qual | 2018/02/25 02:35 | Yunseong Chung v Takuto Niki | 6-7,6-3,6-3 |
| Challenger Yokohama Qual | 2018/02/24 07:05 | Takuto Niki v N.Sriram Balaji | 3-6,7-6,7-5 |
| Challenger Kyoto Qual | 2018/02/19 03:45 | Blake Ellis v Takuto Niki | 6-3,6-4 |
| Challenger Kyoto Qual | 2018/02/18 06:05 | Masaki Osafune v Takuto Niki | 3-6,2-6 |
| Challenger Kyoto Qual | 2018/02/17 07:50 | Kaito Itsusaki v Takuto Niki | 4-6,0-6 |
| Challenger Burnie Qual | 2018/01/27 06:00 | Takuto Niki v N. Vijay Sundar Prashanth | 4-6,3-6 |
| Challenger Burnie Qual | 2018/01/27 02:25 | Takuto Niki v Thomas Bosancic | 6-3,6-2 |
| ITF Hong Kong F6 | 2018/01/04 02:00 | Matteo Viola v Takuto Niki | 6-1,6-3 |
| ITF Japan F1 | 2018/03/05 01:00 | Sota Fujii v Naoya Maesaki | 6-3,4-6,4-6 |
| ITF Japan F1 | 2018/03/04 01:00 | Naoya Maesaki v Yuga Tashiro | 6-3,6-4 |
| ITF Japan F8 | 2017/06/10 05:00 | Luca Castelnuovo v Naoya Maesaki | 6-3,6-4 |
| ITF Japan F3 | 2017/03/19 01:00 | Chan-Yeong Oh v Naoya Maesaki | 6-2,6-4 |
| ITF Japan F3 | 2017/03/18 05:30 | Naoya Maesaki v Shunrou Takeshima | 0-6,6-1,6-1 |