Stadium: Hard Court 2 Round: 62 Ground: Hardcourt outdoor
| ITF Korea F3 | 2017/06/13 04:40 | Jung-Woong Na v Ki Su Jung | 6-4,6-1 |
| ITF Turkey F2 | 2018/01/16 07:30 | Ki Su Jung v Calin Manda | 7-6,3-6,6-7 |
| ITF Korea F5 | 2017/06/28 04:55 | Daniel Yoo v Ki Su Jung | 6-0,6-1 |
| ITF Korea F4 | 2017/06/20 02:30 | Ki Su Jung v Min-Kyu Song | 3-6,0-6 |
| ITF Korea F3 | 2017/06/13 04:40 | Jung-Woong Na v Ki Su Jung | 6-4,6-1 |
| ITF Korea F2 Qual | 2017/06/03 03:00 | Ki Su Jung v Ivan Kalinin | 6-7,2-6 |
| ITF Korea F1 Qual | 2017/05/27 01:00 | Jaeyoung Park v Ki Su Jung | 7-5,6-3 |
| Challenger Busan Qual | 2017/05/13 03:15 | Ki Su Jung v Joe Salisbury | 4-6,6-4,3-6 |
| Challenger Seoul Qual | 2017/05/06 02:40 | Ki Su Jung v Austin Krajicek | 1-6,2-6 |
| ITF Turkey F3 | 2018/01/22 10:00 | Mohsen Hossein Zade v Jung-Woong Na | 2-6,0-6 |
| ITF Turkey F2 | 2018/01/15 07:00 | Jakob Sude v Jung-Woong Na | 4-6,7-5,6-4 |
| ITF Turkey F2 | 2018/01/14 07:00 | Jung-Woong Na v Alen Rogic-Hadzalic | 6-2,6-1 |
| ITF Korea F5 | 2017/06/29 01:30 | Seong Chan Hong v Jung-Woong Na | 6-4,2-6,7-6 |
| ITF Korea F5 | 2017/06/28 01:00 | Hyung-Chan Lim v Jung-Woong Na | 6-4,5-7,2-6 |
| ITF Korea F4 | 2017/06/22 02:00 | Jung-Woong Na v Cheong-Eui Kim | 6-4,2-6,1-6 |
| ITF Korea F4 | 2017/06/20 02:20 | Jung-Woong Na v Sung Jun Park | 6-4,6-3 |
| ITF Korea F3 | 2017/06/15 01:00 | Min-Kyu Song v Jung-Woong Na | 6-1,6-1 |