Tasuku Iwami defeated Seung Hoon Lee 6-7 6-3 6-4 in the Indonesia F3 round of 16 on hard. The upset overturned the form book — Seung Hoon Lee came in leading the head-to-head 2–0. Tasuku Iwami claimed a first win over Seung Hoon Lee in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-04-19 | Japan F2 | R16 | carpet | Seung Hoon Lee | 6-3 6-1 |
| 1998-05-25 | Korea F1 | R32 | hard | Seung Hoon Lee | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.