| 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 Korea F3 | 2017/06/15 01:00 | Yunseong Chung v Daniel Yoo | 5-7,4-6 |
| ITF Korea F3 | 2017/06/14 01:00 | Jae Hwan Kim v Daniel Yoo | 5-7,5-7 |
| ITF Korea F2 | 2017/06/07 03:50 | Min-Kyu Song v Daniel Yoo | 3-6,7-6,6-4 |
| ITF Turkey F5 | 2018/02/06 08:30 | Ji Hoon Son v Ji Sung Nam | 4-6,7-6,6-1 |
| ITF Turkey F5 | 2018/02/05 07:30 | Ji Sung Nam v Yuichiro Inui | 7-5,6-0 |
| ITF Turkey F5 | 2018/02/04 07:30 | Ji Sung Nam v Ki Su Jung | 7-6,6-3 |
| ITF Turkey F4 | 2018/01/29 08:00 | Ji Sung Nam v Dan Dowson | 7-5,6-7,4-6 |
| ITF Turkey F4 | 2018/01/28 07:30 | Ji Sung Nam v Sorin Andrei Iordache | 6-2,6-4 |
| ITF Thailand F12 | 2017/12/14 03:30 | Renta Tokuda v Ji Sung Nam | 6-3,6-2 |
| ITF Thailand F12 | 2017/12/13 04:30 | Ji Sung Nam v Daniel Altmaier | 7-5,6-2 |
| ITF Thailand F12 | 2017/12/12 08:20 | Hady Habib v Ji Sung Nam | 5-7,5-7 |