Simona Halep defeated Ekaterina Alexandrova 6-1 6-4 in the Stuttgart quarter-final on clay. The upset overturned the form book — Ekaterina Alexandrova came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Halep S. took it in straight sets.
Clay: Halep S. leads 1–0 · Hard: Alexandrova E. leads 2–1
Simona Halep beat Ekaterina Alexandrova 6-1 6-4. Umpiry, "Simona Halep vs Ekaterina Alexandrova — Stuttgart Quarter-final", https://umpiry.com/match/2021-04-19/alexandrova-vs-halep-stuttgart-qf?utm_source=cite (as of 19 April 2021).