Kateryna Kozlova defeated Alyona Sotnikova 6-3 6-3 in the Moscow 25K qualifying round on clay. The upset overturned the form book — Alyona Sotnikova came in leading the head-to-head 1–0. Kateryna Kozlova claimed a first win over Alyona Sotnikova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-05-25 | Kharkiv 10K | QF | clay | Alyona Sotnikova | 4-6 7-6(3) 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.