Stadium: Court C Round: 44 Ground: Hardcourt outdoor
| ITF M15 Changwon | 2019/10/14 01:30 | Geun Wook Lee v Jungwon Park | 6-4,6-3 |
| 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 Anning | 2019/01/14 05:30 | Grigoriy Lomakin v Young Seok Lee | 6-1,4-6,13-11 |