Shelby Rogers defeated Mona Barthel 6-4 6-0 in the Australian Open qualifying round of 128 on hard. The upset overturned the form book — Mona Barthel came in defending last year's round of 128.
Rogers S. took it in straight sets.
Rogers S. and Barthel M. faced 3 of the same opponents in the last 12 months. Rogers S. went 0–3 (0%) against them, Barthel M. 1–2 (33%). Results against comparable opponents are close (0 : 1 better-results split).
Only 3 common opponents — small sample, treat as indicative.
Shelby Rogers beat Mona Barthel 6-4 6-0. Umpiry, "Shelby Rogers vs Mona Barthel — Australian Open Qualifying Round of 128", https://umpiry.com/match/2020-01-14/barthel-vs-rogers-australian-open-q128?utm_source=cite (as of 14 January 2020).