Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF Japan F5 | 2018/04/01 00:30 | Ken Onoda v Masaki Sasai | 3-6,1-6 |
| ITF Japan F5 | 2018/03/31 00:30 | Takashi Saito v Ken Onoda | 3-6,4-6 |
| 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 Japan F5 | 2018/04/03 04:10 | Sho Katayama v Renta Tokuda | 2-6,4-6 |
| ITF Japan F4 | 2018/03/30 03:30 | Sho Katayama v Yosuke Watanuki | 4-6,4-6 |
| ITF Japan F4 | 2018/03/29 03:45 | Sho Katayama v Tamaki Yamao | 6-4,6-4 |
| ITF Japan F4 | 2018/03/27 03:00 | Kento Takeuchi v Sho Katayama | 6-4,4-6,5-7 |
| ITF Japan F3 | 2018/03/22 08:45 | Sho Katayama v Kaito Uesugi | 3-6,1-6 |
| ITF Japan F3 | 2018/03/22 04:05 | Shuichi Sekiguchi v Sho Katayama | 5-7,6-4,2-6 |
| ITF Japan F3 | 2018/03/19 01:00 | Sho Katayama v Soichiro Moritani | 6-2,6-0 |
| ITF Japan F2 | 2018/03/13 03:00 | Kaichi Uchida v Sho Katayama | 7-6,6-3 |