Stadium: Court 8 Round: 62 Ground: Hardcourt outdoor
| 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 |
| Challenger Busan Qual | 2018/05/12 01:00 | Kim, Dong Ju v Lee, Tae-Woo | 4-6,4-6 |
| Challenger Gimcheon Qual | 2018/05/05 06:00 | Kim, Young Seok v Kim, Dong Ju | 6-1,6-3 |
| Challenger Seoul Qual | 2018/04/28 01:30 | Sanhui Shin v Kim, Dong Ju | 6-4,6-4 |
| ITF Korea F5 | 2017/06/28 04:40 | Kim, Dong Ju v Nam, Hyun Woo | 0-6,4-6 |
| ITF Korea F5 | 2017/06/27 01:30 | Sungbeen Sim v Kim, Dong Ju | 3-6,6-3,2-6 |