Romina Oprandi defeated Yvonne Meusburger 6-4 6-4 in the Marrakech quarter-final on clay. The upset overturned the form book — Yvonne Meusburger came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Oprandi R. took it in straight sets.
Oprandi R. and Meusburger Y. faced 4 of the same opponents in the last 12 months. Oprandi R. went 2–2 (50%) against them, Meusburger Y. 2–2 (50%). Only 2 of the comparisons are context-comparable — too few for a conclusion.
Only 4 common opponents — small sample, treat as indicative.
Romina Oprandi beat Yvonne Meusburger 6-4 6-4. Umpiry, "Romina Oprandi vs Yvonne Meusburger — Marrakech Quarter-final", https://umpiry.com/match/2014-04-25/meusburger-vs-oprandi-marrakech-qf?utm_source=cite (as of 25 April 2014).