Tetsuya Chaen defeated Kentaro Masuda 6-2 2-6 6-2 in the Japan 1 Masters 4 qualifying round on hard. The upset overturned the form book — Kentaro Masuda came in leading the head-to-head 1–0, but Tetsuya Chaen had been the form player, winning 2 of their last 7 on hard. Tetsuya Chaen claimed a first win over Kentaro Masuda in two meetings, levelling the head-to-head at 1–1.
Chaen T. came through in three sets.
Tetsuya Chaen beat Kentaro Masuda 6-2 2-6 6-2. Umpiry, "Tetsuya Chaen vs Kentaro Masuda — Japan 1 Masters 4 Qualifying Round", https://umpiry.com/match/1997-07-07/chaen-vs-masuda-japan-1-masters-4-qf?utm_source=cite (as of 7 July 1997).