Kai Chen Chang defeated Catalina Castano 6-4 6-0 in the Tokyo qualifying round of 32 on hard. The result followed the form book — Kai Chen Chang came in defending last year's round of 16.
Chen Chang K. took it in straight sets.
Chen Chang K. and Castano C. faced 3 of the same opponents in the last 12 months. Chen Chang K. went 1–2 (33%) against them, Castano C. 1–2 (33%). Only 2 of the comparisons are context-comparable — too few for a conclusion.
Only 3 common opponents — small sample, treat as indicative.
Kai Chen Chang beat Catalina Castano 6-4 6-0. Umpiry, "Kai Chen Chang vs Catalina Castano — Tokyo Qualifying Round of 32", https://umpiry.com/match/2010-09-24/castano-vs-chang-tokyo-q32?utm_source=cite (as of 24 September 2010).