Stadium: Court 16 Round: 54 Ground: Hardcourt outdoor
| Korea F3, Singles Qualifying | 2018/06/16 02:00 | Yoon, Jaeheon v Kim, Seong Kwan | 6-4,6-4 |
| Korea F3, Singles Qualifying | 2018/06/17 03:00 | Yoon, Ilsang v Yoon, Jaeheon | 7-5,6-2 |
| Korea F3, Singles Qualifying | 2018/06/16 02:00 | Yoon, Jaeheon v Kim, Seong Kwan | 6-4,6-4 |
| ITF Korea F2 | 2018/06/10 01:00 | Yoon, Jaeheon v Kim, Sang Yeop | 1-6,1-6 |
| ITF Korea F2 | 2018/06/09 01:00 | Yoon, Jaeheon v Choi, Seungri | 6-1,7-5 |
| ITF Korea F1 | 2018/06/03 02:00 | Kim, Byeonghun v Yoon, Jaeheon | 6-1,6-2 |
| ITF Korea F4 | 2017/06/17 04:00 | Park, Jun Sang v Yoon, Jaeheon | 6-0,6-2 |
| Korea F3, Singles Qualifying | 2017/06/11 03:00 | Yoon, Jaeheon v Cho, Hyeong Jin | 2-6,1-6 |
| ITF Korea F2 Qual | 2017/06/03 03:00 | Lee, Tae-Woo v Yoon, Jaeheon | 7-6,6-2 |
| ITF - M15 Daegu | 2019/06/03 04:10 | Lee, Woo Young v Kim, Seong Kwan | 6-3,6-1 |
| ITF Thailand F8 | 2018/11/03 04:30 | Mulada, Tonkla v Kim, Seong Kwan | 6-1,6-2 |
| ITF Thailand F7 | 2018/10/28 03:00 | Kim, Seong Kwan v Alexander Donski | 5-7,3-6 |
| ITF Korea F6 | 2018/08/30 05:50 | Lucas Catarina v Kim, Seong Kwan | 6-2,6-4 |
| ITF Korea F6 | 2018/08/27 02:00 | Kim, Sung Hun v Kim, Seong Kwan | 4-6,6-7 |
| ITF Korea F6 | 2018/08/25 01:00 | Kim, Seong Kwan v Kim, Yu-Seob | 6-4,6-3 |
| Korea F3, Singles Qualifying | 2018/06/16 02:00 | Yoon, Jaeheon v Kim, Seong Kwan | 6-4,6-4 |
| ITF Korea F2 | 2018/06/10 02:00 | Park, Sung Jun v Kim, Seong Kwan | 7-6,6-1 |