| ITF Japan F5 | 06/02 01:00 | - | 越智 真 v Onozawa, Arata | 3-6,6-2,6-4 | |
| ITF China F6 | 05/28 02:00 | - | Onozawa, Arata v Ning, Yuqing | Retired | |
| ITF China F6 | 05/26 07:20 | - | Onozawa, Arata v Gong, Peng-Xiang | 6-0,6-2 | |
| ITF China F6 | 05/20 02:00 | - | Onozawa, Arata v シ,シ | 4-6,1-6 | |
| ITF Thailand F9 | 05/06 03:00 | - | Onozawa, Arata v Burapharitta, Phassawit | 6-2,0-6,5-7 | |
| ITF Thailand F9 | 05/05 04:25 | - | Onozawa, Arata v 越智 真 | 6-3,6-3 | |
| ITF Thailand F9 | 04/29 04:55 | - | Sornbutnark, Warit v Onozawa, Arata | 6-3,6-2 | |
| ITF Thailand F9 | 04/28 07:15 | - | Shiga, Masato v Onozawa, Arata | 3-6,6-7 | |
| ITF Japan F4 | 03/30 05:00 | - | Onozawa, Arata v 関口 周一 | 4-6,4-6 | |
| ITF Japan F3 | 03/24 03:20 | - | 内山 靖崇 v Onozawa, Arata | 6-3,6-2 | |
| ITF Japan F2 | 03/17 04:10 | - | Sasai, Masaki v Onozawa, Arata | 6-4,6-4 | |
| ITF Japan F1 | 03/12 01:00 | - | Onozawa, Arata v オオニシ,ケン | 3-6,6-1,5-7 | |
| ITF Japan F1 | 03/10 01:00 | - | Onozawa, Arata v Hashimoto, Taiki | 6-2,6-1 | |
| ITF Turkey F2 | 01/17 07:00 | - | Onozawa, Arata v アレクセイ・ヴァトゥーチン | 2-6,2-6 | |
| ITF Turkey F2 | 01/15 12:55 | - | Jankovic, Miki v Onozawa, Arata | 4-6,7-6,0-6 | |
| ITF Turkey F1 | 01/08 08:00 | - | ユーゴ・ニス v Onozawa, Arata | 6-1,6-2 | |
| ITF Turkey F1 | 01/07 08:00 | - | Alekseenko, Gleb v Onozawa, Arata | 4-6,4-6 | |
| ITF Australia F7 | 10/05 23:00 | - | ミッチェル・クルーガー v Onozawa, Arata | 6-2,6-4 | |
| ITF Australia F6 | 09/29 00:30 | - | Hobart, Daniel v Onozawa, Arata | 6-7,6-4,6-4 | |
| ITF Chinese Taipei F1 | 08/26 04:40 | - | チウ,ユ・シン v Onozawa, Arata | Retired | |
| ITF Chinese Taipei F1 | 08/22 02:00 | - | Huang, Liang-Chi v Onozawa, Arata | 6-1,6-4 | |
| ITF Chinese Taipei F1 | 08/21 04:25 | - | Onozawa, Arata v 柏 衍(バイ・イェン) | Walkover | |
| ITF Chinese Taipei F1 | 08/19 03:50 | - | Hu, Hao-Yang v Onozawa, Arata | 4-6,0-6 | |
| ITF Hong Kong F3 | 07/24 02:00 | - | 竹内 研人 v Onozawa, Arata | Retired | |
| ITF Hong Kong F3 | 07/21 02:00 | - | タン,アントソニー・ジャッキー v Onozawa, Arata | 4-6,0-6 | |
| ITF Hong Kong F2 | 07/17 02:00 | - | エバン・ソン v Onozawa, Arata | 6-1,6-0 | |
| ITF Hong Kong F2 | 07/16 02:00 | - | ソング,ミン・キュー v Onozawa, Arata | 6-4,3-6,3-6 | |
| ITF Japan F8 | 06/28 01:00 | - | 内山 靖崇 v Onozawa, Arata | 6-2,6-2 | |
| ITF Japan F8 | 06/27 01:00 | - | Watanuki, Keisuke v Onozawa, Arata | 3-6,4-6 | |
| ITF Japan F8 | 06/24 01:00 | - | Ho, Chih-Jen v Onozawa, Arata | 2-6,2-6 |