Stadium: Court 6 Round: 54 Ground: Clay
| 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 Indonesia F8 | 2017/11/28 03:30 | Ken Onoda v Cheng-Yu Yu | 1-6,2-6 |
| ITF Japan F4 | 2018/03/25 01:00 | Soichiro Moritani v Masaki Sasai | 6-4,6-3 |
| ITF Japan F4 | 2018/03/24 00:00 | Takuya Kumasaka v Masaki Sasai | 3-6,6-4,3-6 |
| ITF Japan F3 | 2018/03/18 01:30 | Issei Okamura v Masaki Sasai | 6-3,6-1 |
| ITF Japan F3 | 2018/03/17 04:00 | Ryohei Tagata v Masaki Sasai | 5-7,6-3,2-6 |
| ITF Japan F2 | 2018/03/12 00:30 | Jack Murray v Masaki Sasai | 6-4,6-3 |
| ITF Japan F1 | 2018/03/07 01:00 | Masaki Sasai v Yuta Shimizu | 5-7,6-7 |
| ITF Japan F1 | 2018/03/06 01:00 | Sho Shimabukuro v Masaki Sasai | 6-7,3-6 |
| ITF Japan F1 | 2018/03/04 03:00 | Keisuke Numajiri v Masaki Sasai | 1-6,6-3,0-6 |