Atsuo Ogawa defeated Takahiro Terachi 4-6 7-5 6-3 in the Japan F1 round of 16 on carpet. The upset overturned the form book — Takahiro Terachi came in leading the head-to-head 3–0. Atsuo Ogawa claimed a first win over Takahiro Terachi in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-04-10 | Japan F1 | R32 | hard | Takahiro Terachi | 6-3 2-6 6-3 |
| 2003-09-08 | Japan F7 | R32 | hard | Takahiro Terachi | 6-4 7-6(2) |
| 2003-04-14 | Japan F2 | R32 | hard | Takahiro Terachi | 1-6 6-0 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.