Takahiro Terachi defeated Tetsuya Chaen 6-2 6-3 in the Korea Rep F3 round of 32 on hard. The upset overturned the form book — Tetsuya Chaen came in leading the head-to-head 6–2. Takahiro Terachi narrowed the head-to-head to 6–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-09 | Japan F4 | R32 | clay | Tetsuya Chaen | 6-2 7-5 |
| 2006-10-23 | Japan F12 | R16 | hard | Tetsuya Chaen | 2-6 6-4 6-3 |
| 2000-05-08 | Japan F4 | R16 | hard | Takahiro Terachi | 6-0 7-5 |
| 1999-06-07 | Japan 1 Masters 2 | R16 | hard | Takahiro Terachi | 6-2 6-0 |
| 1998-03-25 | Japan F2 | R16 | carpet | Tetsuya Chaen | 6-3 6-1 |
| 1997-07-07 | Japan 1 Masters 3 | R32 | hard | Tetsuya Chaen | 6-4 6-2 |
| 1997-07-07 | Japan 1 Masters 2 | R16 | hard | Tetsuya Chaen | 6-3 4-6 6-3 |
| 1995-11-06 | Japan Masters 1 | R32 | hard | Tetsuya Chaen | 6-1 6-1 |
Averages over each player's completed matches in the selected window (1 vs 1). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. Small sample — read as indicative. About