Andrea Hlavackova defeated Klara Koukalova 6-4 6-4 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, but Andrea Hlavackova had been the form player, winning 2 of their last 4 on hard. Andrea Hlavackova claimed a first win over Klara Koukalova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-12-31 | Shenzhen | R32 | hard | Klara Koukalova | 6-1 6-1 |
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 (103 vs 76). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About