| ITF Japan F7 | 06/08 03:30 | 26 | Ito, Yuya v Onozawa, Arata | 6-4,6-1 | |
| ITF Japan F7 | 06/06 05:05 | 25 | Onozawa, Arata v Onishi, Ken | 6-4,6-7,6-0 | |
| ITF Japan F6 | 05/31 01:00 | 25 | Makoto Ochi v Onozawa, Arata | 6-2,6-3 | |
| ITF China F7 | 05/17 04:30 | 25 | Onozawa, Arata v Wei-De Lin | 3-6,3-6 | |
| ITF China F6 | 05/12 02:00 | 26 | Onozawa, Arata v Michael Geerts | 4-6,6-7 | |
| ITF China F6 | 05/10 04:20 | 25 | Ning, Yuqing v Onozawa, Arata | 3-6,7-5,4-6 | |
| ITF Japan F5 | 04/08 01:00 | 26 | Onozawa, Arata v Ito, Yuichi | 6-1,6-7,4-6 | |
| ITF Japan F5 | 04/05 07:30 | 25 | Onozawa, Arata v Kaito Uesugi | 6-3,6-4 | |
| ITF Japan F2 | 03/14 02:00 | 25 | Takeuchi, Kento (1987) v Onozawa, Arata | Retired | |
| ITF Japan F1 | 03/10 07:45 | 26 | Saito, Takashi v Onozawa, Arata | Retired | |
| ITF Japan F1 | 03/10 04:25 | 25 | Onozawa, Arata v Kondo, Hiroki | Retired | |
| ITF China F2 | 02/24 02:00 | 26 | Onozawa, Arata v Ubiergo, Jordan | 3-6,2-6 | |
| ITF China F2 | 02/22 05:20 | 25 | Duan, Jia Qi v Onozawa, Arata | 6-7,3-6 | |
| ITF China F1 | 02/18 03:40 | 26 | Ubiergo, Jordan v Onozawa, Arata | 7-5,2-6,6-3 | |
| ITF China F1 | 02/17 06:10 | 25 | Qi, Xi v Onozawa, Arata | 2-6,2-6 | |
| ITF Chinese Taipei F1 | 08/18 02:00 | 25 | Onozawa, Arata v Kuan-Yi Lee | Retired | |
| ITF China F13 | 08/14 02:00 | 27 | Onozawa, Arata v Yang, Tsung-Hua | 4-6,6-7 | |
| ITF China F13 | 08/13 02:00 | 26 | Kibi, Yuya v Onozawa, Arata | 6-1,1-6,2-6 | |
| ITF China F13 | 08/12 02:00 | 25 | Onozawa, Arata v Hadavi, Shawn H | 6-3,6-0 | |
| ITF China F12 | 08/09 07:00 | 29 | Onozawa, Arata v Yan Bai | 2-6,3-6 | |
| ITF China F12 | 08/08 03:05 | 28 | Onozawa, Arata v Duckhee Lee | 6-2,0-6,6-4 | |
| ITF China F12 | 08/07 07:00 | 27 | Onozawa, Arata v Cao, Zhaoyi | 6-0,6-2 | |
| ITF China F12 | 08/05 08:00 | 26 | Huang, Liang-Chi v Onozawa, Arata | Retired | |
| ITF China F12 | 08/04 01:30 | 25 | Onozawa, Arata v Qiu, Zhuoyang | 6-4,6-0 | |
| ITF Japan F8 | 06/26 03:35 | - | Yasutaka Uchiyama v Onozawa, Arata | 6-4,6-4 | |
| ITF Japan F8 | 06/25 02:50 | - | Moon, Ju-Hae v Onozawa, Arata | 2-6,0-6 | |
| ITF Japan F8 | 06/24 01:10 | - | Ono, Masayoshi v Onozawa, Arata | 2-6,2-6 | |
| ITF Japan F7 | 06/19 03:00 | - | Onozawa, Arata v Jumpei Yamasaki | 6-2,4-6,0-6 | |
| ITF Japan F7 | 06/18 00:30 | - | Onozawa, Arata v Renta Tokuda | 6-4,6-2 | |
| ITF Japan F7 | 06/16 02:15 | - | Onozawa, Arata v Watanuki, Keisuke | 7-6,0-6,6-3 |