Stadium: Court F Round: 28 Ground: Hardcourt outdoor
| Challenger Seoul Qual | 2017/05/06 02:20 | Daniel Nguyen v Takuto Niki | 2-6,6-1,6-2 |
| Challenger Yokohama Qual | 2018/02/26 01:00 | Hiroki Moriya v Daniel Nguyen | 6-2,6-3 |
| Challenger Yokohama Qual | 2018/02/25 02:20 | Yuta Shimizu v Daniel Nguyen | 6-4,5-7,2-6 |
| Challenger Yokohama Qual | 2018/02/24 06:35 | Nasa Hatakeyama v Daniel Nguyen | 1-6,3-6 |
| ITF Egypt F5 | 2018/02/16 12:00 | Jaimee Floyd Angele v Daniel Nguyen | 6-7,6-2,6-3 |
| ITF Egypt F5 | 2018/02/15 09:45 | Jelle Sels v Daniel Nguyen | 4-6,7-5,0-6 |
| ITF Egypt F5 | 2018/02/13 08:00 | Kirill Kivattsev v Daniel Nguyen | 5-7,6-7 |
| ITF Egypt F4 | 2018/02/07 08:00 | David Poljak v Daniel Nguyen | 4-6,7-6,6-3 |
| ITF Egypt F3 | 2018/01/31 14:00 | Tomas Papik v Daniel Nguyen | 6-2,7-5 |
| 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 |