Stadium: Court F Round: 45 Ground: Hardcourt indoor
| ITF Japan F6 Qual | 2018/04/07 01:00 | Tamaki Yamao v Kazuki Nishiwaki | 6-4,3-6,3-6 |
| ITF Japan F5 | 2018/03/31 00:30 | Yu Hsiang Chiu v Tamaki Yamao | 6-2,7-6 |
| ITF Japan F4 | 2018/03/29 03:45 | Sho Katayama v Tamaki Yamao | 6-4,6-4 |
| ITF Japan F4 | 2018/03/28 01:00 | Yuya Kibi v Tamaki Yamao | 6-0,4-6,2-6 |
| ITF Japan F4 | 2018/03/25 01:00 | Tamaki Yamao v Ko Suzuki | 6-4,6-2 |
| ITF Japan F4 | 2018/03/24 00:00 | Tae-Woo Lee v Tamaki Yamao | 1-6,4-6 |
| ITF Japan F3 | 2018/03/19 01:00 | Tamaki Yamao v Hiroyasu Ehara | 6-2,3-6,0-6 |
| ITF Japan F3 | 2018/03/18 01:00 | Teppei Uesugi v Tamaki Yamao | 3-6,4-6 |
| ITF Japan F8 | 2018/06/13 01:00 | Kaito Uesugi v Naoki Tajima | 2-6,6-3,6-3 |
| ITF Japan F6 | 2018/04/13 01:30 | Naoki Tajima v Makoto Ochi | 4-6,6-1,0-6 |
| ITF Japan F6 | 2018/04/12 03:50 | Shunrou Takeshima v Naoki Tajima | 6-4,2-6,4-6 |
| ITF Japan F6 Qual | 2018/04/10 01:00 | Yuki Yudate v Naoki Tajima | 2-6,0-6 |
| ITF Japan F5 | 2018/04/04 05:10 | Naoki Tajima v Yusuke Takahashi | 4-6,2-6 |
| ITF Japan F5 | 2018/04/02 04:35 | Rimpei Kawakami v Naoki Tajima | 3-6,4-6 |
| ITF Japan F4 | 2018/03/29 04:15 | Naoki Tajima v Shintaro Imai | 4-6,3-6 |
| ITF Japan F4 | 2018/03/28 02:40 | Takuto Niki v Naoki Tajima | 5-7,6-7 |