Takahiro Terachi defeated Tetsuya Chaen 6-0 7-5 in the Japan F4 round of 16 on hard. The upset overturned the form book — Tetsuya Chaen came in leading the head-to-head 4–1. Takahiro Terachi narrowed the head-to-head to 4–2.
Terachi T. took it in straight sets.
Hard: Chaen T. leads 3–2 · Carpet: Chaen T. leads 1–0
Takahiro Terachi beat Tetsuya Chaen 6-0 7-5. Umpiry, "Takahiro Terachi vs Tetsuya Chaen — Japan F4 Round of 16", https://umpiry.com/match/2000-05-08/chaen-vs-terachi-japan-f4-r16?utm_source=cite (as of 8 May 2000).