Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF Japan F3 | 2018/03/18 01:00 | Teppei Uesugi v Tamaki Yamao | 3-6,4-6 |
| ITF Japan F3 | 2018/03/17 02:30 | Tamaki Yamao v Jack Murray | 4-6,6-3,6-2 |
| ITF Japan F3 | 2018/03/17 00:30 | Tamaki Yamao v Taketo Takamisawa | 6-1,6-3 |
| ITF Japan F2 | 2018/03/13 04:40 | Tamaki Yamao v Makoto Ochi | 7-5,3-6,1-6 |
| ITF Japan F2 | 2018/03/12 00:30 | Tamaki Yamao v Tomohiro Masabayashi | 6-3,4-6,6-1 |
| ITF Japan F2 | 2018/03/11 00:30 | Hayato Kudo v Tamaki Yamao | 1-6,0-6 |
| ITF Japan F1 | 2018/03/03 03:00 | Takashi Saito v Tamaki Yamao | 7-6,6-4 |
| Challenger Kyoto Qual | 2018/02/17 06:40 | Blake Ellis v Tamaki Yamao | 6-4,6-4 |
| ITF Japan F2 | 2018/03/13 02:10 | Yuta Shimizu v Hiroyasu Ehara | 7-6,6-3 |
| Challenger Yokohama | 2018/03/01 03:35 | Jordan Thompson v Hiroyasu Ehara | 6-4,6-2 |
| Challenger Yokohama | 2018/02/27 06:50 | Hiroyasu Ehara v Andrew Whittington | 7-6,6-7,6-4 |
| Challenger Yokohama Qual | 2018/02/26 01:00 | Zhe Li v Hiroyasu Ehara | 6-7,6-3,4-6 |
| Challenger Yokohama Qual | 2018/02/25 01:00 | Tung-Lin Wu v Hiroyasu Ehara | 5-7,3-6 |
| Challenger Yokohama Qual | 2018/02/24 03:45 | Luca Margaroli v Hiroyasu Ehara | 1-6,2-6 |
| Challenger Kyoto Qual | 2018/02/18 04:50 | Hiroyasu Ehara v Luke Saville | 6-7,3-6 |
| Challenger Kyoto Qual | 2018/02/17 04:45 | Hiroyasu Ehara v Naru Shirafuji | 7-5,6-2 |