| ITF Korea F1 Qual | 2014/04/29 00:30 | Jung-Woong Na v Hiromasa Oku | 6-3,6-4 |
| ITF Korea F1 | 2016/06/16 01:00 | Jung-Woong Na v Dylan Seong Kwan Kim | 4-6,6-3,6-7 |
| ITF Korea F1 | 2016/06/14 01:30 | Jung-Woong Na v Hyun-Woo Nam | 7-5,6-2 |
| ITF China F11 | 2015/07/21 03:20 | Jung-Woong Na v Tsung-Hua Yang | 5-7,4-6 |
| ITF China F10 | 2015/07/16 02:00 | Zhe Li v Jung-Woong Na | 6-4,6-3 |
| ITF China F10 | 2015/07/15 03:30 | Jung-Woong Na v Young Seok Kim | 7-5,1-6,6-3 |
| ITF China F10 | 2015/07/14 02:00 | Jung-Woong Na v Ke Ma | 6-0,6-0 |
| ITF Thailand F9 | 2015/06/26 03:00 | Shuichi Sekiguchi v Jung-Woong Na | 6-4,6-3 |
| ITF Thailand F9 | 2015/06/25 03:00 | Pruchya Isarow v Jung-Woong Na | 3-6,3-6 |
| ITF Vietnam F8 | 2016/08/01 02:00 | Hiromasa Oku v Sora Fukuda | 2-6,3-6 |
| ITF Vietnam F8 | 2016/07/30 05:30 | Hiromasa Oku v Ansu Bhuyan | 5-7,6-4,7-5 |
| ITF Japan F8 | 2016/06/15 04:30 | Kazuki Nishiwaki v Hiromasa Oku | 2-6,6-3,6-4 |
| ITF Japan F7 | 2016/06/07 03:40 | Hiromasa Oku v Sho Katayama | 1-6,2-6 |
| ITF Japan F6 | 2016/06/02 01:00 | Hiromasa Oku v Yuya Kibi | 3-6,2-6 |
| ITF Japan F6 | 2016/05/31 01:00 | Takuto Niki v Hiromasa Oku | 2-6,3-6 |
| ITF Guam F1 | 2016/05/24 02:00 | Hiromasa Oku v Shunrou Takeshima | 3-6,2-6 |
| ITF Turkey F19 | 2016/05/13 09:20 | Marc Sieber v Hiromasa Oku | 6-0,6-3 |