Catherine Cartan Bellis defeated Petra Kvitova 6-2 6-0 in the Stanford quarter-final on hard. The result followed the form book — Catherine Cartan Bellis came in defending last year's quarter-final.
Cartan Bellis C. took it in straight sets.
Cartan Bellis C. and Kvitova P. faced 4 of the same opponents in the last 12 months. Cartan Bellis C. went 1–3 (25%) against them, Kvitova P. 3–2 (60%). Only 2 of the comparisons are context-comparable — too few for a conclusion.
Only 4 common opponents — small sample, treat as indicative.
Catherine Cartan Bellis beat Petra Kvitova 6-2 6-0. Umpiry, "Catherine Cartan Bellis vs Petra Kvitova — Stanford Quarter-final", https://umpiry.com/match/2017-08-04/bellis-vs-kvitova-stanford-qf?utm_source=cite (as of 4 August 2017).