Petra Cetkovska defeated Klara Koukalova 6-1 2-6 6-3 in the US Open round of 128 on hard. The upset overturned the form book — Klara Koukalova came in leading the head-to-head 1–0, defending last year's round of 128. Petra Cetkovska claimed a first win over Klara Koukalova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-06-18 | Eastbourne | R16 | grass | Klara Koukalova | 6-1 1-6 6-2 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (37 vs 74). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About