Nina Bratchikova defeated Marta Sirotkina 6-4 6-4 in the Portimao 10K round of 16 on hard. The upset overturned the form book — Marta Sirotkina came in leading the head-to-head 1–0, but Nina Bratchikova had been the form player, winning 2 of their last 5 on hard. Nina Bratchikova claimed a first win over Marta Sirotkina in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-02 | Bukhara 25K | QF | hard | Marta Sirotkina | 6-2 7-6(5) |
Averages over each player's completed matches in the selected window (41 vs 11). 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