Stadium: Court D Round: 25 Ground: Hardcourt outdoor
| ITF M15 Changwon | 2019/10/15 00:50 | Geun Wook Lee v Young Seok Lee | 1-6,1-6 |
| ITF M15 Changwon | 2019/10/14 01:30 | Chan-Yeong Oh v Young Seok Lee | 4-6,6-7 |
| ITF M15 Changwon | 2019/10/13 03:00 | Young Seok Lee v Ren Nakamura | 7-6,6-0 |
| ITF M15 Anseong | 2019/06/26 01:00 | Oh-Hee Kwon v Young Seok Lee | 6-2,6-2 |
| ITF M15 Anseong | 2019/06/25 01:00 | Chanchai Sookton-Eng v Young Seok Lee | 3-6,6-1,9-11 |
| ITF M15 Anseong | 2019/06/24 01:00 | Seon Yong Han v Young Seok Lee | 2-6,1-6 |
| ITF M15 Daegu | 2019/06/03 02:40 | Jung Ho Shin v Young Seok Lee | 4-6,3-6 |
| Challenger Busan | 2019/05/06 02:00 | Makoto Ochi v Young Seok Lee | 6-3,6-4 |
| ITF M15 Anseong | 2019/06/28 03:00 | Jung-Woong Na v Cheong-Eui Kim | 2-6,2-6 |
| ITF M15 Anseong | 2019/06/27 01:00 | Jung-Woong Na v Tae-Woo Lee | 6-3,6-3 |
| ITF M15 Anseong | 2019/06/26 01:00 | Jung-Woong Na v Seungri Choi | 6-1,6-1 |
| ITF M15 Gimcheon | 2019/06/19 01:00 | Seong Taek Im v Jung-Woong Na | 0-6,0-6 |
| ITF M15 Gimcheon | 2019/06/13 02:30 | Jean Thirouin v Jung-Woong Na | 6-2,6-3 |
| ITF M15 Gimcheon | 2019/06/12 04:05 | Jung-Woong Na v Cheong-Eui Kim | 6-2,6-2 |
| ITF M15 Daegu | 2019/06/09 03:25 | Jung-Woong Na v Seong Chan Hong | 0-6,3-6 |
| ITF M15 Daegu | 2019/06/08 05:30 | Cheong-Eui Kim v Jung-Woong Na | 2-6,1-6 |