Tasuku Iwami defeated Oh Hee Kwon 6-1 6-2 in the Korea Rep F4 round of 32 on hard. The upset overturned the form book — Oh Hee Kwon came in leading the head-to-head 2–1. Tasuku Iwami narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-23 | Japan F6 | R32 | carpet | Tasuku Iwami | 6-4 6-1 |
| 2005-07-25 | China F5 | SF | hard | Oh Hee Kwon | 6-3 5-2 |
| 1998-06-29 | Japan 1 Masters 1 | QF | hard | Oh Hee Kwon | 6-0 1-6 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.