| ITF Thailand F4 Qual | 2017/07/30 12:30 | Onozawa, Arata v Nguyen Hoang, Thien | 7-5,4-6,6-1 |
| ITF Hong Kong F1 | 2017/06/20 09:35 | Singh, Karunuday v Onozawa, Arata | 6-4,1-6,6-1 |
| ITF Japan F8 | 2017/06/15 03:05 | Onozawa, Arata v Sano, Koichi | 6-2,1-6,0-6 |
| ITF Japan F8 | 2017/06/14 03:00 | Johan Nikles v Onozawa, Arata | 1-6,0-6 |
| ITF Japan F7 | 2017/06/06 01:00 | Onozawa, Arata v Sasai, Masaki | 6-3,2-6,3-6 |
| ITF Japan F6 | 2017/05/30 03:30 | Sakai, Yuto v Onozawa, Arata | 7-6,7-5 |
| ITF Singapore F1 Qual | 2017/05/21 04:00 | Onozawa, Arata v Look, Michael | 4-6,7-6,4-6 |
| ITF Japan F3 | 2017/03/19 01:00 | Onozawa, Arata v Kawakami, Rimpei | 3-6,6-2,2-6 |
| ITF Thailand F4 Qual | 2017/07/30 08:35 | Tanthaseraneewat, Suthinan v Onoda, Ken | 4-6,7-5,1-6 |
| ITF Guam F1 | 2017/06/23 01:55 | Onoda, Ken v Suzuki, Takao | 3-6,3-6 |
| ITF Guam F1 | 2017/06/22 04:05 | Shirafuji, Naru v Onoda, Ken | 4-6,2-6 |
| ITF Guam F1 | 2017/06/20 07:45 | Reyes, Nicholas Alexander v Onoda, Ken | 4-6,4-6 |
| ITF Singapore F1 | 2017/06/05 02:00 | Onoda, Ken v Linh Giang Trinh | 3-6,4-6 |
| ITF Singapore F2 | 2017/06/01 03:00 | Ramkumar Ramanathan v Onoda, Ken | 6-1,6-2 |
| ITF Singapore F2 | 2017/05/30 07:15 | Congsup Congcar v Onoda, Ken | 7-5,3-6,2-6 |
| ITF Singapore F2 Qual | 2017/05/29 04:20 | Nguyen, David v Onoda, Ken | 3-6,2-6 |