Takahiro Terachi defeated Tetsuya Chaen 6-2 6-0 in the Japan 1 Masters 2 round of 16 on hard. The upset overturned the form book — Tetsuya Chaen came in leading the head-to-head 4–0. Takahiro Terachi claimed a first win over Tetsuya Chaen in five meetings, narrowing the head-to-head to 4–1.
Terachi T. took it in straight sets.
Hard: Chaen T. leads 3–1 · Carpet: Chaen T. leads 1–0
Takahiro Terachi beat Tetsuya Chaen 6-2 6-0. Umpiry, "Takahiro Terachi vs Tetsuya Chaen — Japan 1 Masters 2 Round of 16", https://umpiry.com/match/1999-06-07/chaen-vs-terachi-japan-1-masters-2-r16?utm_source=cite (as of 7 June 1999).