| ITF Japan F8 | 06/15 03:05 | 26 | Onozawa, Arata v Sano, Koichi | 6-2,1-6,0-6 | |
| ITF Japan F8 | 06/14 03:00 | 25 | 니클레스, 조한 v Onozawa, Arata | 1-6,0-6 | |
| ITF Japan F7 | 06/06 01:00 | 25 | Onozawa, Arata v Sasai, Masaki | 6-3,2-6,3-6 | |
| ITF Japan F6 | 05/30 03:30 | 25 | Sakai, Yuto v Onozawa, Arata | 7-6,7-5 | |
| ITF Singapore F1 Qual | 05/21 04:00 | 54 | Onozawa, Arata v Look, Michael | 4-6,7-6,4-6 | |
| ITF Japan F4 | 03/29 05:10 | 25 | Osafune, Masaki v Onozawa, Arata | Retired | |
| ITF Japan F3 | 03/19 01:00 | 62 | Onozawa, Arata v 카와카미, 림페이 | 3-6,6-2,2-6 | |
| ITF Japan F3 | 03/18 06:00 | 62 | Onozawa, Arata v 푸지이, 소타 | 6-4,6-3 | |
| Challenger Kyoto Qual | 02/19 05:25 | 46 | Wang, Jimmy v Onozawa, Arata | 6-3,6-4 | |
| Challenger Kyoto Qual | 02/18 07:35 | 45 | Onozawa, Arata v 타카하시, 유스케 | 6-3,6-7,6-3 | |
| Others | 11/12 07:35 | 46 | Takeuchi, Kento (1987) v Onozawa, Arata | 7-6,6-2 | |
| Others | 11/12 02:10 | 45 | 오니시, 켄 v Onozawa, Arata | 3-6,4-6 | |
| ITF Vietnam F5 | 09/20 06:25 | 25 | Onozawa, Arata v Oh, Chan-Yeong | Retired | |
| ITF Vietnam F4 | 09/15 03:00 | 26 | Onozawa, Arata v 콩카르, 콩섭 | 5-7,4-6 | |
| ITF Vietnam F4 | 09/12 03:00 | 25 | Onozawa, Arata v Sano, Koichi | 2-6,7-6,6-0 | |
| ITF Korea F7 | 09/01 04:05 | 27 | 오치, 마코토 v Onozawa, Arata | 6-2,6-2 | |
| ITF Korea F7 | 08/31 02:00 | 26 | 나, 정웅 v Onozawa, Arata | 6-7,5-7 | |
| ITF Korea F7 | 08/29 02:30 | 25 | Onozawa, Arata v 키쿠치, 겐고 | 3-6,6-2,6-3 | |
| ITF Korea F8 | 08/24 04:20 | 26 | 오치, 마코토 v Onozawa, Arata | 6-3,6-2 | |
| ITF Korea F8 | 08/23 03:25 | 25 | 최, 성리 v Onozawa, Arata | 3-6,3-6 | |
| Vietnam F8, Singles | 08/11 02:00 | 26 | Onozawa, Arata v 푸쿠다, 소라 | Retired | |
| Vietnam F8, Singles | 08/09 02:00 | 25 | Onozawa, Arata v 훙, 주이-첸 | 6-3,6-3 | |
| Vietnam F8, Singles | 08/04 02:30 | 26 | Onozawa, Arata v Mukund, S. | 1-6,3-6 | |
| Vietnam F8, Singles | 08/02 02:00 | 25 | Onozawa, Arata v 카날, 조나단 | 7-5,6-4 | |
| ITF China F10 | 06/28 02:00 | 25 | Onozawa, Arata v Gong, Xiao | Retired | |
| ITF Hong Kong F3 | 06/22 22:00 | 27 | Reinwein, Sami v Onozawa, Arata | 6-2,6-2 | |
| ITF Hong Kong F3 | 06/21 22:00 | 26 | 수산토, 다비드 아궁 v Onozawa, Arata | 3-6,4-6 | |
| ITF Hong Kong F3 | 06/19 22:00 | 25 | 타누마, 리요타 v Onozawa, Arata | 1-6,5-7 | |
| ITF Hong Kong F2 Qual | 06/15 22:00 | 26 | Libietis, Mikelis v Onozawa, Arata | 6-4,7-6 | |
| ITF Hong Kong F2 Qual | 06/14 22:00 | 25 | 시아, 즈하우 v Onozawa, Arata | 4-6,2-6 |