Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| ITF Korea F1 | 2014/04/24 01:00 | Ji Sung Nam v Jung-Woong Na | 7-5,6-2 |
| ITF Korea F1 | 2018/06/06 02:15 | Ji Sung Nam v Daniel Yoo | 6-4,6-3 |
| ITF Vietnam F3 | 2018/05/20 03:00 | Ji Sung Nam v Pruchya Isarow | 6-4,6-2 |
| ITF Vietnam F3 | 2018/05/18 03:00 | Ji Hoon Son v Ji Sung Nam | 1-6,2-6 |
| ITF Vietnam F3 | 2018/05/17 03:00 | Ji Sung Nam v Abhinav Sanjeev Shanmugam | 7-6,6-2 |
| ITF Vietnam F3 | 2018/05/16 05:30 | Rio Noguchi v Ji Sung Nam | 3-6,1-6 |
| ITF Vietnam F3 | 2018/05/15 04:55 | Nicholas Bybel v Ji Sung Nam | 4-6,2-6 |
| ITF Vietnam F2 | 2018/05/13 04:00 | Rio Noguchi v Ji Sung Nam | 7-6,6-3 |
| ITF Vietnam F2 | 2018/05/12 04:45 | Gengo Kikuchi v Ji Sung Nam | 4-6,3-6 |
| ITF Korea F1 | 2018/06/06 01:00 | Jung-Woong Na v Ji Hoon Son | 6-4,6-7,6-4 |
| Challenger Busan | 2018/05/15 05:50 | Max Purcell v Jung-Woong Na | 6-4,6-1 |
| Challenger Gimcheon Qual | 2018/05/05 05:20 | Jacob Grills v Jung-Woong Na | 5-7,6-4,6-3 |
| Challenger Seoul Qual | 2018/04/29 02:00 | Jung-Woong Na v Makoto Ochi | 2-6,4-6 |
| Challenger Seoul Qual | 2018/04/28 03:05 | Jung-Woong Na v Tae-Woo Lee | 6-1,6-3 |
| ITF Turkey F5 | 2018/02/08 07:30 | Jung-Woong Na v Nino Serdarusic | 1-6,2-6 |
| ITF Turkey F5 | 2018/02/06 07:30 | Razvan M Codescu v Jung-Woong Na | 3-6,0-6 |
| ITF Turkey F5 | 2018/02/05 07:30 | Jung-Woong Na v Luka Miklavcic | 6-4,6-0 |