Stadium: Court A Round: 44 Ground: Hardcourt outdoor
| 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 | Seonyong 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 |
| ITF M15 Anning | 2019/01/14 01:30 | Young Seok Lee v Ruikai Wang | 6-3,5-7,10-3 |
| ITF M15 Anning | 2018/12/31 01:30 | Young Seok Lee v Ye Cong Mo | 2-6,6-1,3-10 |
| Challenger Yokkaichi | 2019/08/06 03:15 | Ren Nakamura v Lucas Catarina | 1-6,2-6 |
| ITF M25 Taipei | 2019/07/23 03:50 | Ren Nakamura v Sam Taylor | 4-6,7-5,6-10 |
| ITF M25 Taipei | 2019/07/22 02:00 | Ren Nakamura v Harry Thursfield | 6-2,6-2 |
| ITF M25 Taipei | 2019/07/16 03:50 | Ren Nakamura v Seita Watanabe | 6-4,4-6,5-10 |
| ITF M15 Anseong | 2019/06/26 04:30 | Sung Hun Kim v Ren Nakamura | 7-6,1-6,6-0 |
| ITF M15 Gimcheon | 2019/06/18 01:00 | Ren Nakamura v Minjong Park | 5-7,6-7 |
| ITF M15 Gimcheon | 2019/06/17 01:00 | Ren Nakamura v Sam Ryan Ziegann | 2-6,6-2,10-7 |
| ITF M15 Karuizawa | 2019/05/30 06:15 | Gengo Kikuchi v Ren Nakamura | 6-2,6-2 |