Takahiro Terachi defeated Yasufumi Yamamoto 6-2 6-0 in the Japan F4 qualifying round on hard. The result followed the form book — Takahiro Terachi came in leading the head-to-head 3–0. Takahiro Terachi extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-18 | Japan F5 | QF | carpet | Takahiro Terachi | 6-2 7-6 |
| 1998-06-29 | Japan 1 Masters 1 | R16 | hard | Takahiro Terachi | 6-2 6-2 |
| 1998-05-25 | Korea F1 | R32 | hard | Takahiro Terachi | 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.