Ground: Synthetic outdoor
| ITF Japan F3 | 2015/03/24 03:20 | Yasutaka Uchiyama v Arata Onozawa | 6-3,6-2 |
| ITF Japan F2 | 2015/03/17 04:10 | Masaki Sasai v Arata Onozawa | 6-4,6-4 |
| ITF Japan F1 | 2015/03/12 01:00 | Arata Onozawa v Ken Onishi | 3-6,6-1,5-7 |
| ITF Japan F1 | 2015/03/10 01:00 | Arata Onozawa v Taiki Hashimoto | 6-2,6-1 |
| ITF Turkey F2 | 2015/01/17 07:00 | Arata Onozawa v Alexey Vatutin | 2-6,2-6 |
| ITF Turkey F2 | 2015/01/15 12:55 | Miki Jankovic v Arata Onozawa | 4-6,7-6,0-6 |
| ITF Turkey F1 | 2015/01/08 08:00 | Hugo Nys v Arata Onozawa | 6-1,6-2 |
| ITF Turkey F1 | 2015/01/07 08:00 | Gleb Alekseenko v Arata Onozawa | 4-6,4-6 |
| ITF Turkey F34 | 2014/09/27 07:00 | Ben Mclachlan v Jumpei Yamasaki | 7-5,6-4 |
| ITF Turkey F33 | 2014/09/22 07:00 | Scott Clayton v Jumpei Yamasaki | 3-6,6-7 |
| ITF Italy F13 | 2014/05/07 12:25 | Viktor Galovic v Jumpei Yamasaki | 7-6,6-3 |
| ITF Italy F13 | 2014/05/05 10:00 | Jumpei Yamasaki v Goncalo Oliveira | 6-3,1-6,6-4 |
| ITF Italy F12 | 2014/05/01 09:00 | Jumpei Yamasaki v Gibril Diarra | 6-7,4-6 |
| ITF Italy F12 | 2014/04/30 08:30 | Riccardo Sinicropi v Jumpei Yamasaki | 4-6,6-7 |