Takahiro Terachi defeated Yong Il Yoon 6-0 7-6 in the Japan F2 semi-final on hard. The upset overturned the form book — Yong Il Yoon came in leading the head-to-head 3–2, but Takahiro Terachi had been the form player, winning 1 of their last 4 on hard. Takahiro Terachi narrowed the head-to-head to 3–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-05-12 | Korea Rep F3 | F | hard | Takahiro Terachi | 6-0 7-5 |
| 2000-05-08 | Japan F4 | F | hard | Takahiro Terachi | 2-6 7-6(7) 6-1 |
| 1999-06-07 | Japan 1 Masters 3 | SF | hard | Yong Il Yoon | 3-6 6-1 6-4 |
| 1998-10-07 | Japan F4 | SF | carpet | Yong Il Yoon | 3-6 7-5 7-6 |
| 1998-05-04 | China F1 | SF | hard | Yong Il Yoon | 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.