Stadium: Court 14 Round: 27
| ITF Vietnam F3 | 2018/05/18 03:00 | Son, Ji Hoon v Nam, Ji Sung | 1-6,2-6 |
| ITF Turkey F5 | 2018/02/06 08:30 | Son, Ji Hoon v Nam, Ji Sung | 4-6,7-6,6-1 |
| ITF Korea F5 | 2018/08/23 04:45 | Nam, Ji Sung v Bourchier, Edward | 6-2,6-2 |
| ITF Korea F5 | 2018/08/21 01:00 | Nam, Ji Sung v Han, Seong Jae | 6-1,6-0 |
| Challenger - Gwangju | 2018/08/19 01:55 | Banes, Maverick v Nam, Ji Sung | 6-3,4-6,6-4 |
| Challenger - Gwangju | 2018/08/18 02:00 | Alexander Bublik v Nam, Ji Sung | 6-7,5-7 |
| Challenger - Gwangju | 2018/08/17 03:30 | Akira Santillan v Nam, Ji Sung | 2-6,3-6 |
| Challenger - Gwangju | 2018/08/16 06:00 | Xia, Zihao v Nam, Ji Sung | 2-6,3-6 |
| Challenger - Gwangju | 2018/08/14 08:20 | Nam, Ji Sung v Henri Laaksonen | 6-1,6-1 |
| Challenger Gwangju Qual | 2018/08/13 01:00 | Nam, Ji Sung v Reinwein, Sami | 6-2,6-4 |
| ITF Korea F5 | 2018/08/23 05:15 | Jang, Woo Hyeok v Son, Ji Hoon | 6-7,1-6 |
| ITF Korea F5 | 2018/08/21 01:00 | Ren Nakamura v Son, Ji Hoon | 6-4,4-6,3-6 |
| Challenger - Gwangju | 2018/08/14 06:30 | Mousley, Bradley v Son, Ji Hoon | 6-3,6-2 |
| Challenger Gwangju Qual | 2018/08/13 01:00 | Kibi, Yuya v Son, Ji Hoon | 3-6,4-6 |
| Challenger Gwangju Qual | 2018/08/11 03:35 | Son, Ji Hoon v Gao, Xin | 7-5,6-3 |
| ITF China F10 | 2018/07/10 02:00 | Son, Ji Hoon v Gao, Xin | 6-7,6-7 |
| ITF China F9 | 2018/07/08 03:00 | Son, Ji Hoon v Yan Bai | 7-6,4-6,4-6 |
| ITF China F9 | 2018/07/07 07:25 | Hong, Seong Chan v Son, Ji Hoon | 6-7,1-6 |