Stadium: Court 8 Round: 62 Ground: Clay
| ITF Greece F4 | 2018/03/18 09:30 | Tikhomirov, Maksim v Ono, Masayoshi | 7-6,6-2 |
| ITF Greece F4 | 2018/03/17 07:30 | Ono, Masayoshi v Saatela, Leevi | 6-1,6-0 |
| ITF Greece F3 | 2018/03/10 10:00 | Ono, Masayoshi v Matos, Diego | 5-7,4-6 |
| ITF Greece F1 | 2018/02/25 09:00 | Matos, Diego v Ono, Masayoshi | 3-6,7-6,6-4 |
| ITF Turkey F4 | 2018/01/29 08:00 | Nikita Mashtakov v Ono, Masayoshi | 6-4,6-0 |
| ITF Turkey F4 | 2018/01/28 07:30 | Ono, Masayoshi v Vladusic, Nenad | 1-6,6-2,6-3 |
| ITF Turkey F4 | 2018/01/27 07:30 | Ono, Masayoshi v Ozcelik, Bulut | 6-1,6-2 |
| ITF Turkey F3 | 2018/01/20 07:00 | Ono, Masayoshi v Nikita Mashtakov | 7-6,3-6,4-6 |
| ITF Japan F5 | 2018/04/01 00:30 | Onoda, Ken v Sasai, Masaki | 3-6,1-6 |
| ITF Japan F5 | 2018/03/31 00:30 | Saito, Takashi v Onoda, Ken | 3-6,4-6 |
| ITF Greece F3 | 2018/03/10 07:30 | Moreno, Federico v Onoda, Ken | 6-3,6-4 |
| ITF Greece F2 | 2018/03/04 08:00 | Duje Ajdukovic v Onoda, Ken | 7-5,7-6 |
| ITF Greece F2 | 2018/03/03 07:30 | Onoda, Ken v Lavdas, Andreas Anastasis | 6-1,6-2 |
| Turkey F8, Singles Qualifying | 2018/02/27 07:30 | Felipe Meligeni Rodrigues Alves v Onoda, Ken | 6-4,6-2 |
| Turkey F8, Singles Qualifying | 2018/02/25 07:30 | Amar, Ran v Onoda, Ken | 3-6,5-7 |
| Turkey F8, Singles Qualifying | 2018/02/24 09:30 | Busch, Ruben v Onoda, Ken | 2-6,2-6 |