Round: 25 Ground: Hardcourt outdoor
| ITF Greece F4 | 2017/03/26 10:00 | Benjamin Sigouin v Masayoshi Ono | 6-1,6-3 |
| ITF Greece F4 | 2017/03/25 07:00 | Masayoshi Ono v Denis Merkulov | 6-3,6-3 |
| ITF Greece F2 Qual | 2017/03/14 07:30 | Masayoshi Ono v Nicholas S. Hu | 6-7,3-6 |
| ITF Greece F2 Qual | 2017/03/11 07:00 | Vlad Cristian Niculae v Masayoshi Ono | 6-7,1-6 |
| ITF Greece F1 | 2017/03/04 10:00 | Anastasios Pavlis v Masayoshi Ono | 6-3,6-2 |
| Others | 2016/11/05 02:00 | Yuki Mochizuki v Masayoshi Ono | 2-6,6-3,6-4 |
| ITF Vietnam F8 | 2016/10/30 03:00 | Mukund Sasikumar v Masayoshi Ono | 6-3,6-2 |
| ITF Vietnam F8 | 2016/10/29 03:00 | Masayoshi Ono v Chengze Lyu | 6-2,7-5 |
| ITF Greece F4 | 2017/03/28 11:35 | Tomas Barrios Vera v Jonny O'Mara | 6-4,6-3 |
| ITF Greece F3 | 2017/03/23 09:00 | Jonny O'Mara v Dzmitry Zhyrmont | 7-6,4-6,4-6 |
| ITF Greece F3 | 2017/03/22 13:10 | Vit Kopriva v Jonny O'Mara | 6-4,3-6,2-6 |
| ITF Great Britain F1 | 2017/02/03 10:00 | Jonny O'Mara v Hugo Grenier | 7-5,5-7,1-6 |
| ITF Great Britain F1 | 2017/02/02 11:50 | Fran Zvonimir Zgombic v Jonny O'Mara | 4-6,4-6 |
| ITF Great Britain F1 | 2017/01/31 12:10 | Jonny O'Mara v Luke Oakley | 6-1,6-0 |
| ITF Qatar F6 | 2016/12/12 23:00 | Omar Alawadhi v Jonny O'Mara | 1-6,2-6 |
| ITF Qatar F4 | 2016/12/03 12:51 | Jonny O'Mara v Daniel Altmaier | 5-7,3-6 |