Aleksandrina Naydenova defeated Elizabeth Ferris 6-2 6-1 in the Concepcion 10K qualifying round on clay. The upset overturned the form book — Elizabeth Ferris came in leading the head-to-head 1–0. Aleksandrina Naydenova claimed a first win over Elizabeth Ferris in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-04-04 | Caracas 10K | QF | hard | Elizabeth Ferris | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.