Round: 62 Ground: Hardcourt outdoor
| Korea F3, Singles Qualifying | 2018/06/16 02:00 | Yoon, Ilsang v Dong Ju Kim | 6-2,6-2 |
| ITF Korea F1 | 2018/06/03 01:00 | Jeong, Young-Hoon v Yoon, Ilsang | 6-4,5-7,6-2 |
| ITF Korea F1 | 2018/06/02 03:30 | Yoon, Ilsang v Han, Jin Sung | 7-6,4-6,6-3 |
| Indonesia F8, Singles Qualifying | 2017/11/26 05:10 | Manish Sureshkumar v Yoon, Ilsang | 6-0,6-1 |
| Indonesia F8, Singles Qualifying | 2017/11/25 06:00 | Tagashira, Kento v Yoon, Ilsang | 6-7,6-3,6-7 |
| ITF Indonesia F7 Qual | 2017/11/19 05:25 | Natthasith Kunsuwan v Yoon, Ilsang | 6-2,7-5 |
| ITF Indonesia F7 Qual | 2017/11/18 03:00 | Yoon, Ilsang v Goldenberg, Dustin | 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 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 Korea F1 Qual | 2016/06/12 03:00 | Kwon, OH-Hee v Yoon, Jaeheon | 6-1,6-0 |