| Challenger Busan Qual | 2018/05/12 01:00 | Luke Saville v Daniel Yoo | 6-1,6-0 |
| Challenger Gimcheon Qual | 2018/05/05 01:30 | Daniel Yoo v Ben Patael | 3-6,2-6 |
| Challenger Seoul Qual | 2018/04/28 01:30 | Daniel Yoo v Ji Sung Nam | 2-6,2-6 |
| Challenger Gwangju Qual | 2017/09/16 01:30 | Woo Hyeok Jang v Daniel Yoo | 6-4,6-4 |
| ITF Korea F5 | 2017/06/29 04:50 | Daniel Yoo v Ku Keon Kang | 3-6,3-6 |
| ITF Korea F5 | 2017/06/28 04:55 | Daniel Yoo v Ki Su Jung | 6-0,6-1 |
| ITF Korea F4 | 2017/06/20 01:00 | Daniel Yoo v Hyung-Chan Lim | 6-2,6-2 |
| ITF Korea F3 | 2017/06/16 02:00 | Daniel Yoo v Hong Chung | 3-6,0-6 |
| ITF Thailand F7 Qual | 2017/09/30 02:30 | Yu-Seob Kim v Suthinan Tanthaseraneewat | 2-6,2-6 |
| ITF Korea F3 Qual | 2017/06/10 03:00 | Yu-Seob Kim v Woo-Ram Kim | 2-6,2-6 |
| ITF Korea F2 Qual | 2017/06/04 04:30 | Yu-Seob Kim v In Kyo Jeong | 3-6,5-7 |
| ITF Korea F2 Qual | 2017/06/03 03:00 | Yu-Seob Kim v Sung Hun Kim | 6-1,6-4 |
| ITF Korea F1 Qual | 2017/05/28 03:30 | Sung Jun Park v Yu-Seob Kim | 6-0,6-1 |
| Challenger Seoul Qual | 2017/05/06 06:05 | Yu-Seob Kim v Shuichi Sekiguchi | 1-6,4-6 |
| ITF Korea F8 | 2016/09/04 04:30 | Yu-Seob Kim v Jeamoon Lee | 3-6,1-6 |
| ITF Korea F8 | 2016/08/28 02:00 | Yu-Seob Kim v Chan-Yeong Oh | 3-6,2-6 |