Ground: Synthetic outdoor
| ITF Japan F6 | 2014/06/14 02:00 | Hiromasa Oku v Yuya Kibi | 0-6,2-6 |
| ITF Japan F6 | 2014/06/13 02:50 | Shunrou Takeshima v Hiromasa Oku | 1-6,0-6 |
| ITF Japan F6 | 2014/06/13 00:00 | Hiromasa Oku v Jui-Chen Hung | 6-2,6-4 |
| ITF Japan F6 | 2014/06/10 03:20 | Gengo Kikuchi v Hiromasa Oku | 3-6,6-7 |
| ITF Japan F5 | 2014/06/05 01:00 | Hiromasa Oku v Yuya Kibi | 4-6,2-6 |
| ITF Japan F5 | 2014/06/04 01:00 | Hiromasa Oku v Katsuki Nagao | 7-6,7-6 |
| ITF Japan F5 | 2014/06/03 02:30 | Takashi Saito v Hiromasa Oku | 2-6,4-6 |
| ITF Korea F1 Qual | 2014/04/29 00:30 | Jung-Woong Na v Hiromasa Oku | 6-3,6-4 |
| ITF Japan F6 | 2014/06/13 00:00 | Chih-Jen Ho v Arata Onozawa | 6-4,6-2 |
| ITF Japan F6 | 2014/06/10 01:30 | Soichiro Moritani v Arata Onozawa | 1-6,6-7 |
| ITF Thailand F10 | 2014/05/29 03:00 | Arata Onozawa v Jacob Grills | 3-6,1-6 |
| ITF Thailand F10 | 2014/05/28 05:10 | Arata Onozawa v Chayanon Kaewsuto | 6-0,6-4 |
| ITF Thailand F10 | 2014/05/27 06:20 | Arata Onozawa v Warit Sornbutnark | 7-6,6-1 |
| ITF Japan F1 | 2014/03/14 01:00 | Di Wu v Arata Onozawa | 6-3,6-0 |
| ITF Japan F1 | 2014/03/11 02:55 | Arata Onozawa v Masaki Osafune | 4-6,6-1,6-3 |