Young Jun Kim defeated Yong Il Yoon 6-4 6-3 in the Korea Rep F2 qualifying round on clay. The upset overturned the form book — Yong Il Yoon came in leading the head-to-head 3–0. Young Jun Kim claimed a first win over Yong Il Yoon in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-05-12 | Korea Rep F3 | R16 | hard | Yong Il Yoon | 2-6 6-4 6-4 |
| 2002-05-20 | Korea Rep F2 | R32 | clay | Yong Il Yoon | 5-7 6-3 5-0 |
| 1998-05-25 | Korea F1 | R16 | hard | Yong Il Yoon | 6-2 6-1 |