Bernarda Pera defeated Katerina Siniakova 6-3 6-1 in the Hamburg quarter-final on clay. The upset overturned the form book — Katerina Siniakova came in ranked #53, leading the head-to-head 5–0. Bernarda Pera claimed a first win over Katerina Siniakova in six meetings, narrowing the head-to-head to 5–1.
Pera B. took it in straight sets.
Pera B. and Siniakova K. faced 4 of the same opponents in the last 12 months. Pera B. went 2–2 (50%) against them, Siniakova K. 0–5 (0%). Results against comparable opponents are close (1 : 0 better-results split).
Only 4 common opponents — small sample, treat as indicative.
Clay: level 1–1 · Hard: Siniakova K. leads 4–0