Katarzyna Piter defeated Dinah Pfizenmaier 5-7 6-3 6-1 in the Rio de Janeiro round of 16 on clay. The upset overturned the form book — Dinah Pfizenmaier came in leading the head-to-head 1–0. Katarzyna Piter claimed a first win over Dinah Pfizenmaier in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-09-12 | Rotterdam 25K | QF | clay | Dinah Pfizenmaier | 6-4 6-2 |
Averages over each player's completed matches in the selected window (148 vs 34). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About