Round: 54 Ground: Hardcourt outdoor
| Akishima, Singles M-ITF-JPN-08A | 2019/06/11 00:00 | Hirano, Taiyo v Lee, Seounghun | 6-4,6-2 |
| ITF - M15 Daegu | 2019/06/03 01:00 | Park, Sung Jun v Lee, Seounghun | 6-2,6-0 |
| ITF Korea F5 | 2018/08/21 05:05 | Lee, Seounghun v Jae Hwan Kim | 1-6,0-6 |
| ITF Korea F5 | 2018/08/20 01:00 | Lee, Seounghun v Dong Ju Kim | 6-1,6-1 |
| ITF Korea F5 | 2018/08/19 02:00 | Ma, William v Lee, Seounghun | 6-3,4-6,3-6 |
| ITF Korea F5 | 2018/08/18 01:00 | Lee, Young Seok v Lee, Seounghun | 3-6,2-6 |
| ITF Korea F4 | 2018/08/13 01:00 | Ku Keon Kang v Lee, Seounghun | 6-2,6-2 |
| ITF Korea F4 | 2018/08/12 02:00 | Yun, Jae Won v Lee, Seounghun | 6-3,2-6,6-7 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/17 01:00 | Im, Seong Taek v Jeong, Young-Hoon | 5-7,6-3,10-6 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/13 05:00 | Jeong, Young-Hoon v Seon Yong Han | 6-3,3-6,5-7 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/12 01:00 | Niki, Takuto v Jeong, Young-Hoon | 4-6,6-7 |
| ITF Korea F6 | 2018/08/28 02:00 | Yeongseok Jeong v Jeong, Young-Hoon | 7-5,7-6 |
| Challenger Gwangju Qual | 2018/08/11 04:45 | Mladenov, Vasko v Jeong, Young-Hoon | 6-0,6-2 |
| ITF China F10 Qual | 2018/07/09 04:05 | Jeong, Young-Hoon v Wu, Hao | 3-6,1-6 |
| ITF China F10 Qual | 2018/07/08 02:00 | Jeong, Young-Hoon v Barclay, David | 6-1,6-3 |
| ITF China F9 | 2018/07/05 03:00 | Wu, Hao v Jeong, Young-Hoon | 6-7,6-0,6-2 |