Stadium: Court 5 Round: 54 Ground: Clay
| ITF Japan F4 | 2018/03/24 02:00 | Masamichi Imamura v Takashi Saito | 6-4,6-4 |
| ITF Japan F3 | 2018/03/19 02:15 | Masaya Kobayashi v Takashi Saito | 6-4,4-6,6-4 |
| ITF Japan F3 | 2018/03/18 01:00 | Soichiro Moritani v Takashi Saito | 6-3,3-6,0-6 |
| ITF Japan F3 | 2018/03/17 04:00 | Kenta Kurita v Takashi Saito | 7-5,3-6,0-6 |
| ITF Japan F2 | 2018/03/13 04:45 | Takashi Saito v Naoki Nakagawa | 4-6,6-3,1-6 |
| ITF Japan F1 | 2018/03/10 02:00 | Takashi Saito v Wishaya Trongcharoenchaikul | 4-6,7-5,4-6 |
| ITF Japan F1 | 2018/03/08 03:10 | Yuichi Ito v Takashi Saito | 2-6,4-6 |
| ITF Japan F1 | 2018/03/07 01:00 | Takashi Saito v Makoto Ochi | 6-3,2-6,6-4 |
| ITF Greece F3 | 2018/03/10 07:30 | Federico Moreno v Ken Onoda | 6-3,6-4 |
| ITF Greece F2 | 2018/03/04 08:00 | Duje Ajdukovic v Ken Onoda | 7-5,7-6 |
| ITF Greece F2 | 2018/03/03 07:30 | Ken Onoda v Andreas A Lavdas | 6-1,6-2 |
| ITF Turkey F8 | 2018/02/27 07:30 | Felipe Meligeni Rodrigues Alves v Ken Onoda | 6-4,6-2 |
| ITF Turkey F8 | 2018/02/25 07:30 | Ran Amar v Ken Onoda | 3-6,5-7 |
| ITF Turkey F8 | 2018/02/24 09:30 | Ruben Busch v Ken Onoda | 2-6,2-6 |
| ITF Indonesia F8 | 2017/11/28 03:30 | Ken Onoda v Cheng-Yu Yu | 1-6,2-6 |
| ITF Indonesia F8 Qual | 2017/11/26 03:30 | Ken Onoda v Jun Chong | 6-0,6-2 |