Karolina Kosinska defeated Ganna Piven 7-5 6-4 in the Sibenik TBC 10K qualifying round on clay. The upset overturned the form book — Ganna Piven came in leading the head-to-head 1–0. Karolina Kosinska claimed a first win over Ganna Piven in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-03-22 | Namangan 25K | R32 | hard | Ganna Piven | 7-6(1) 6-4 |