Hee Seok Chung defeated Michihisa Onoda 6-2 6-4 in the Korea Rep F1 qualifying round on hard. The upset overturned the form book — Michihisa Onoda came in leading the head-to-head 1–0, but Hee Seok Chung had been the form player, winning 10 of their last 10 on hard. Hee Seok Chung claimed a first win over Michihisa Onoda in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-05-10 | Korea Rep F2 | R16 | hard | Michihisa Onoda | 6-4 7-5 |