| Challenger Busan Qual | 2017/05/13 05:50 | Yunseong Chung v Seong-Gook Oh | 6-4,6-7,3-6 |
| ITF Korea F4 | 2017/06/20 04:15 | Yunseong Chung v Dong-Kyu Lee | 6-3,6-2 |
| ITF Korea F3 | 2017/06/15 01:00 | Yunseong Chung v Daniel Yoo | 5-7,4-6 |
| ITF Korea F3 | 2017/06/14 01:00 | Yunseong Chung v Ji Hoon Son | 7-6,6-4 |
| ITF Korea F2 | 2017/06/08 01:00 | Yunseong Chung v Ji Hoon Son | 6-7,6-0,6-7 |
| ITF Korea F2 | 2017/06/07 07:25 | Yunseong Chung v Tae-Woo Lee | 6-2,6-7,6-1 |
| ITF Korea F1 | 2017/05/31 01:00 | Dylan Seong Kwan Kim v Yunseong Chung | 5-7,6-3,6-4 |
| Challenger Busan Qual | 2017/05/13 05:50 | Yunseong Chung v Seong-Gook Oh | 6-4,6-7,3-6 |
| Challenger Seoul | 2017/05/10 03:30 | Yunseong Chung v Hiroki Moriya | 6-4,6-7,3-6 |
| ITF Korea F4 | 2017/06/20 02:55 | Hyun-Woo Nam v Seong-Gook Oh | 2-6,2-6 |
| ITF Korea F4 | 2017/06/19 01:00 | Seong-Gook Oh v Hyeong Don Kim | 6-3,6-1 |
| ITF Korea F4 | 2017/06/18 02:00 | Seong-Gook Oh v Dong Woon Kang | 7-5,6-4 |
| ITF Korea F3 | 2017/06/14 01:00 | Seong-Gook Oh v Tae-Woo Lee | 2-6,4-6 |
| ITF Korea F3 Qual | 2017/06/12 03:00 | Seong-Gook Oh v Jun Sang Park | 7-5,7-6 |
| ITF Korea F3 Qual | 2017/06/11 04:30 | Seong-Gook Oh v A-Ram Kim | 6-3,6-1 |
| ITF Korea F3 Qual | 2017/06/10 03:00 | Seong-Gook Oh v In Kyo Jeong | 6-3,6-4 |
| ITF Korea F2 Qual | 2017/06/03 03:00 | Seong-Gook Oh v Jun Sang Park | 4-6,2-6 |