Seung Hoon Lee defeated Yong Il Yoon 6-1 6-4 in the Japan F1 round of 16 on carpet. The upset overturned the form book — Yong Il Yoon came in leading the head-to-head 1–0. Seung Hoon Lee claimed a first win over Yong Il Yoon in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-05-25 | Korea F1 | QF | hard | Yong Il Yoon | 6-3 6-2 |