Michihisa Onoda defeated Hee Seok Chung 6-4 7-5 in the Korea Rep F2 round of 16 on hard. The upset overturned the form book — Hee Seok Chung came in leading the head-to-head 1–0. Michihisa Onoda claimed a first win over Hee Seok Chung in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-05-03 | Korea Rep F1 | QF | hard | Hee Seok Chung | 6-2 6-4 |