Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| Challenger Seoul Qual | 2018/04/28 01:30 | Yoo, Daniel v Nam, Ji Sung | 2-6,2-6 |
| ITF Vietnam F3 | 2018/05/20 03:00 | Nam, Ji Sung v Isarow, Pruchya | 6-4,6-2 |
| ITF Vietnam F3 | 2018/05/18 03:00 | Son, Ji Hoon v Nam, Ji Sung | 1-6,2-6 |
| ITF Vietnam F3 | 2018/05/17 03:00 | Nam, Ji Sung v Abhinav Sanjeev Shanmugam | 7-6,6-2 |
| ITF Vietnam F3 | 2018/05/16 05:30 | Rio Noguchi v Nam, Ji Sung | 3-6,1-6 |
| ITF Vietnam F3 | 2018/05/15 04:55 | Bybel, Nicholas v Nam, Ji Sung | 4-6,2-6 |
| ITF Vietnam F2 | 2018/05/13 04:00 | Rio Noguchi v Nam, Ji Sung | 7-6,6-3 |
| ITF Vietnam F2 | 2018/05/12 04:45 | Kikuchi, Gengo v Nam, Ji Sung | 4-6,3-6 |
| ITF Vietnam F2 | 2018/05/11 03:00 | Kelsey Stevenson v Nam, Ji Sung | 6-4,2-6,1-6 |
| Challenger Busan Qual | 2018/05/12 01:00 | Luke Saville v Yoo, Daniel | 6-1,6-0 |
| Challenger Gimcheon Qual | 2018/05/05 01:30 | Yoo, Daniel v Patael, Ben | 3-6,2-6 |
| Challenger Seoul Qual | 2018/04/28 01:30 | Yoo, Daniel v Nam, Ji Sung | 2-6,2-6 |
| Challenger Gwangju Qual | 2017/09/16 01:30 | Jang, Woo Hyeok v Yoo, Daniel | 6-4,6-4 |
| ITF Korea F5 | 2017/06/29 04:50 | Yoo, Daniel v Kang, Ku Keon | 3-6,3-6 |
| ITF Korea F5 | 2017/06/28 04:55 | Yoo, Daniel v Jung, Ki-Su | 6-0,6-1 |
| ITF Korea F4 | 2017/06/20 01:00 | Yoo, Daniel v Lim, Hyung-Chan | 6-2,6-2 |
| ITF Korea F3 | 2017/06/16 02:00 | Yoo, Daniel v Chung, Hong | 3-6,0-6 |