| ITF Korea F8 | 08/25 02:00 | 27 | Song, Min-Kyu v Kim, Young Seok | 6-4,1-6,5-7 | |
| ITF Korea F8 | 08/24 04:55 | 26 | Kim, Young Seok v Cho, Min Hyeok | 7-5,6-2 | |
| ITF Korea F8 | 08/22 06:55 | 25 | Kim, Young Seok v Uisung Park | 7-5,6-4 | |
| ITF Korea F1 | 06/16 01:00 | 26 | Moon, Ju-Hae v Kim, Young Seok | 7-5,6-4 | |
| ITF Korea F1 | 06/15 01:00 | 25 | Sanhui Shin v Kim, Young Seok | 4-6,0-6 | |
| ITF Japan F4 | 03/31 02:55 | 26 | Kim, Young Seok v Yosuke Watanuki | 2-6,0-6 | |
| ITF Japan F4 | 03/29 03:10 | 25 | Kim, Young Seok v Saito, Takashi | Retired | |
| ITF Japan F3 | 03/24 03:15 | 27 | Kim, Young Seok v Sekiguchi, Shuichi | 2-6,0-6 | |
| ITF Japan F3 | 03/23 03:10 | 26 | Ehara, Hiroyasu v Kim, Young Seok | Retired | |
| ITF Japan F3 | 03/21 01:15 | 25 | Singh, Karunuday v Kim, Young Seok | 2-6,1-6 | |
| ITF Japan F2 | 03/15 04:25 | 25 | Kim, Young Seok v Issei Okamura | 7-6,3-6,4-6 | |
| ITF Japan F1 | 03/10 04:30 | 25 | Kim, Young Seok v Saito, Takashi | 4-6,2-6 | |
| ITF China F3 | 03/05 05:00 | 29 | Lopez Perez v Kim, Young Seok | 6-4,7-6 | |
| ITF China F3 | 03/04 02:00 | 28 | Kim, Young Seok v Miljan Zekic | 6-4,7-5 | |
| ITF China F3 | 03/03 02:00 | 27 | Kim, Young Seok v Centenari, Alexander | 6-2,6-2 | |
| ITF China F3 | 03/02 02:00 | 26 | Kim, Young Seok v Ning, Yuqing | 7-6,6-2 | |
| ITF China F3 | 02/29 06:20 | 25 | Kim, Young Seok v Liu, Hu | 6-1,6-2 | |
| ITF China F2 | 02/25 04:30 | 26 | Petit, Gabriel v Kim, Young Seok | 6-2,4-6,6-3 | |
| ITF China F2 | 02/23 02:00 | 25 | Shiga, Masato v Kim, Young Seok | 4-6,3-6 | |
| ITF USA F6 | 02/05 15:00 | 27 | Kim, Young Seok v Geens, Clement | 2-6,6-4,3-6 | |
| ITF USA F6 | 02/04 15:30 | 26 | Turini, Thales v Kim, Young Seok | 3-6,6-7 | |
| ITF USA F6 | 02/02 14:00 | 25 | Kim, Young Seok v Riffice, Sam | 2-6,7-5,6-2 | |
| ITF USA F5 | 01/30 15:30 | 27 | Kim, Young Seok v Pla Malfeito, Jaume | 4-6,5-7 | |
| ITF USA F5 | 01/29 17:00 | 26 | Malla, Bastian v Kim, Young Seok | Retired | |
| ITF USA F5 | 01/27 19:00 | 25 | Maciej Rajski v Kim, Young Seok | 5-7,6-4,3-6 | |
| ITF USA F4 | 01/19 16:30 | 25 | Kim, Young Seok v Mina, Gianni | 2-6,2-6 | |
| ITF USA F3 | 01/16 20:15 | 28 | Tommy Paul v Kim, Young Seok | 6-1,6-3 | |
| ITF USA F3 | 01/16 15:00 | 27 | Hidalgo, Diego v Kim, Young Seok | 5-7,6-4,5-7 | |
| ITF USA F3 | 01/13 20:40 | 25 | Lippens, Michael v Kim, Young Seok | 6-3,3-6,4-6 | |
| ITF Thailand F9 | 11/30 05:35 | 25 | Kim, Young Seok v Wachiramanowong, Kittipong | 4-6,4-6 |