Andrea Petkovic defeated Katerina Siniakova 6-4 4-6 6-1 in the Cincinnati qualifying round 1 on hard. The upset overturned the form book — Katerina Siniakova came in leading the head-to-head 2–1. Andrea Petkovic narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-10-15 | Luxembourg | R16 | hard | Andrea Petkovic | 6-2 6-3 |
| 2018-04-30 | Prague | R32 | clay | Katerina Siniakova | 6-2 7-6(4) |
| 2015-06-15 | Birmingham | R32 | grass | Katerina Siniakova | 4-6 6-1 7-6(4) |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About
Averages over each player's completed matches in the selected window (27 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Siniakova K.: 13 days rest · 1 match (14d). Higher means fresher. About