Stadium: Court 7 Round: 62 Ground: Hardcourt outdoor
| ITF Korea F2 | 2018/06/11 03:30 | Yoo, Daniel v Kim, Yu-Seob | 7-5,6-4 |
| ITF Korea F2 | 2018/06/10 05:00 | Yoo, Daniel v Bendeck, Jose Daniel | 6-2,6-2 |
| ITF Korea F1 | 2018/06/06 02:15 | Nam, Ji Sung v Yoo, Daniel | 6-4,6-3 |
| 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 Ku Keon Kang | 3-6,3-6 |
| ITF Korea F2 | 2018/06/09 01:00 | Yoon, Jaeheon v Choi, Seungri | 6-1,7-5 |
| ITF Korea F1 | 2018/06/02 01:00 | Cho, Hyeong Jin v Choi, Seungri | 6-2,6-4 |
| Challenger Gwangju Qual | 2017/09/16 02:55 | Choi, Seungri v Niesten, Miliaan | 2-6,4-6 |
| ITF Korea F5 | 2017/06/28 01:00 | Choi, Seungri v Song, Min-Kyu | 1-6,2-6 |
| ITF Korea F4 | 2017/06/20 01:00 | Makoto Ochi v Choi, Seungri | 6-1,6-1 |
| ITF Korea F3 | 2017/06/14 01:00 | Choi, Seungri v Jeong, Young-Hoon | 3-6,0-6 |
| ITF Korea F2 | 2017/06/07 04:20 | Kwon, OH-Hee v Choi, Seungri | 6-0,6-1 |
| ITF Korea F1 | 2017/05/30 01:00 | Choi, Jae-Won v Choi, Seungri | 6-3,6-1 |