Hong Chung defeated Chan Yeong Oh 6-2 6-4 in the M25 Daegu 1 round of 32 on hard. The upset overturned the form book — Chan Yeong Oh came in leading the head-to-head 2–0. Hong Chung claimed a first win over Chan Yeong Oh in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-06-14 | M25 Changwon 1 | R32 | hard | Chan Yeong Oh | 6-4 7-5 |
| 2017-06-05 | Korea F2 | R16 | hard | Chan Yeong Oh | 7-6(5) 3-6 6-3 |