Dominika Nociarova defeated Karolina Kosinska 7-6 6-4 in the Warsaw 10K round of 16 on clay. The upset overturned the form book — Karolina Kosinska came in leading the head-to-head 2–0, but Dominika Nociarova had been the form player, winning 3 of their last 7 on clay. Dominika Nociarova claimed a first win over Karolina Kosinska in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-29 | Torun 25K | R32 | clay | Karolina Kosinska | 6-4 6-3 |
| 2006-04-10 | Civitavecchia 25K | R16 | clay | Karolina Kosinska | 6-1 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.