Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF Japan F1 | 2018/03/11 02:00 | Wishaya Trongcharoenchaikul v Daniel Nguyen | 7-5,6-7,4-6 |
| ITF Japan F1 | 2018/03/10 02:00 | Daniel Nguyen v Takuto Niki | 6-3,6-4 |
| ITF Japan F1 | 2018/03/09 02:00 | Naoki Nakagawa v Daniel Nguyen | 6-3,3-6,5-7 |
| ITF Japan F1 | 2018/03/08 05:40 | Rio Noguchi v Daniel Nguyen | 4-6,3-6 |
| ITF Japan F1 | 2018/03/07 05:30 | Shoma Kato v Daniel Nguyen | 0-6,2-6 |
| Challenger Yokohama | 2018/03/01 02:00 | Daniel Nguyen v Stephane Robert | 5-7,0-6 |
| Challenger Yokohama | 2018/02/27 05:35 | Daniel Nguyen v Yosuke Watanuki | 6-2,6-4 |
| Challenger Yokohama Qual | 2018/02/26 01:00 | Hiroki Moriya v Daniel Nguyen | 6-2,6-3 |
| ITF Japan F2 | 2018/03/12 00:30 | Jumpei Yamasaki v Naru Shirafuji | 6-0,6-0 |
| ITF Japan F2 | 2018/03/11 00:30 | Jumpei Yamasaki v Takashi Yasugami | 6-0,6-3 |
| ITF Japan F1 | 2018/03/08 07:15 | Jumpei Yamasaki v Yuki Mochizuki | 1-6,3-6 |
| ITF Japan F1 | 2018/03/06 02:00 | Kaichi Uchida v Jumpei Yamasaki | 6-1,6-7,3-6 |
| Challenger Yokohama | 2018/02/27 04:45 | Jumpei Yamasaki v Stephane Robert | 6-3,1-6,3-6 |
| Challenger Yokohama Qual | 2018/02/26 01:00 | Jumpei Yamasaki v Masamichi Imamura | 4-6,7-6,6-4 |
| Challenger Yokohama Qual | 2018/02/25 01:00 | Maverick Banes v Jumpei Yamasaki | 6-2,1-6,4-6 |
| Challenger Yokohama Qual | 2018/02/24 01:00 | Kento Takeuchi v Jumpei Yamasaki | 3-6,3-6 |