| ITF Korea F5 | 06/29 03:30 | 26 | Kim, Young Seok v Song, Min-Kyu | 6-3,6-2 | |
| ITF Korea F5 | 06/28 01:00 | 25 | Kim, Young Seok v Vinsant, Shane | 6-4,7-5 | |
| ITF Korea F4 | 06/24 03:35 | 28 | Kim, Young Seok v Kim, Cheong-Eui | 4-6,3-6 | |
| ITF Korea F4 | 06/23 02:00 | 27 | Jea Moon Lee v Kim, Young Seok | 6-3,6-7,3-6 | |
| ITF Korea F4 | 06/21 02:00 | 26 | Kim, Woo-Ram v Kim, Young Seok | 3-6,3-6 | |
| ITF Korea F4 | 06/19 04:00 | 25 | Kim, Young Seok v Lim, Yong-Kyu | Retired | |
| ITF Korea F3 | 06/15 01:00 | 26 | Lee, Tae-Woo v Kim, Young Seok | 6-3,6-4 | |
| ITF Korea F3 | 06/13 02:00 | 25 | Kim, Young Seok v Hong, Seong Chan | 6-2,6-4 | |
| ITF Korea F2 | 06/07 04:10 | 25 | Kim, Young Seok v Kim, Cheong-Eui | 1-6,6-7 | |
| ITF Korea F1 | 05/31 01:00 | 25 | Kim, Young Seok v Hong Chung | 1-6,4-6 | |
| Challenger Busan Qual | 05/13 02:00 | 45 | Kim, Young Seok v Jea Moon Lee | 3-6,3-6 | |
| Challenger Seoul | 05/11 03:30 | 26 | Soeda, Go v Kim, Young Seok | 6-2,6-4 | |
| Challenger Seoul | 05/09 05:50 | 25 | Ward, Alexander v Kim, Young Seok | 3-6,4-6 | |
| Challenger Gimcheon Qual | 04/29 04:10 | 45 | Kim, Young Seok v Hubert Hurkacz | 6-2,3-6,2-6 | |
| Thailande F6, Qualifications Simples | 12/27 03:00 | 25 | Congsup Congcar v Kim, Young Seok | 6-2,6-3 | |
| ITF Thailand F5 | 12/21 04:20 | 26 | Cho, Min Hyeok v Kim, Young Seok | 6-2,6-2 | |
| ITF Thailand F5 | 12/19 03:00 | 25 | Kim, Young Seok v Yunseong Chung | 3-6,6-4,7-6 | |
| Others | 11/12 05:50 | 46 | Kondo, Hiroki v Kim, Young Seok | 6-4,6-4 | |
| Others | 11/12 00:30 | 45 | Sasai, Masaki v Kim, Young Seok | 1-6,5-7 | |
| Others | 11/05 03:45 | 45 | Shintaro Imai v Kim, Young Seok | 6-1,6-2 | |
| ITF Vietnam F8 | 10/29 03:00 | 28 | Kim, Young Seok v Enzo Couacaud | 4-6,1-6 | |
| ITF Vietnam F8 | 10/28 03:00 | 27 | Niki Kaliyanda Poonacha v Kim, Young Seok | 4-6,3-6 | |
| ITF Vietnam F8 | 10/27 03:00 | 26 | Gong, Xiao v Kim, Young Seok | 5-7,3-6 | |
| ITF Vietnam F8 | 10/25 05:40 | 25 | Moon, Ju-Hae v Kim, Young Seok | 2-6,2-6 | |
| ITF Vietnam F7 | 10/17 03:00 | 25 | Kim, Young Seok v Skadarka, Stefan | 7-6,6-7,4-6 | |
| ITF Korea F8 | 09/08 03:00 | 27 | Kim, Young Seok v Song, Min-Kyu | 7-5,1-6,2-6 | |
| ITF Korea F8 | 09/07 03:55 | 26 | Kim, Young Seok v Lee, Dong-Kyu | 6-3,6-3 | |
| ITF Korea F8 | 09/06 02:55 | 25 | Kim, Young Seok v Oku, Hiromasa | 6-0,6-2 | |
| ITF Korea F7 | 08/29 02:30 | 25 | Lee, Tae-Woo v Kim, Young Seok | 6-2,6-3 | |
| ITF Korea F8 | 08/26 03:00 | 28 | Kim, Young Seok v Nam, Ji Sung | 2-6,3-6 |