Stadium: Court 4 Round: 25 Ground: Clay
| ITF Japan F5 | 2018/04/01 00:30 | Rio Noguchi v Rimpei Kawakami | 4-6,2-6 |
| ITF Japan F5 | 2018/03/31 00:30 | Rimpei Kawakami v Aoran Wang | 6-3,4-6,6-2 |
| ITF Japan F3 | 2018/03/18 01:00 | Shinji Hazawa v Rimpei Kawakami | 6-3,6-3 |
| ITF Japan F3 | 2018/03/17 04:00 | Rimpei Kawakami v Naru Shirafuji | 6-3,6-2 |
| ITF Japan F3 | 2018/03/17 00:30 | Tomohiro Masabayashi v Rimpei Kawakami | 2-6,4-6 |
| ITF Japan F2 | 2018/03/13 00:30 | Issei Okamura v Rimpei Kawakami | 6-2,6-4 |
| ITF Turkey F4 | 2018/01/29 08:00 | Vladislav Melnic v Rimpei Kawakami | 7-5,6-3 |
| ITF Turkey F3 | 2018/01/23 11:30 | Fran Zvonimir Zgombic v Rimpei Kawakami | 6-4,6-1 |
| 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 |
| ITF Japan F3 | 2018/03/19 06:00 | Seong Chan Hong v Naoki Tajima | 6-1,4-6,6-4 |
| ITF Japan F5 | 2017/04/04 02:30 | Naoki Tajima v Toshihide Matsui | 6-1,4-6,3-6 |
| ITF Japan F5 | 2017/04/02 01:00 | Hiromasa Oku v Naoki Tajima | 1-6,0-6 |
| ITF Japan F5 | 2017/04/01 02:00 | Yuichiro Inui v Naoki Tajima | 4-6,0-6 |
| ITF Japan F4 | 2017/03/29 05:40 | Naoki Tajima v Yusuke Takahashi | 6-3,1-6,4-6 |
| Challenger Kyoto Qual | 2017/02/18 04:20 | Evgeny Karlovskiy v Naoki Tajima | 6-3,6-1 |