Angelique Kerber defeated Joanna Sakowicz Kostecka 6-2 6-4 in the Warsaw 25K qualifying round on carpet. The result followed the form book — Angelique Kerber came in leading the head-to-head 2–0. Angelique Kerber extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-03-12 | Las Palmas De Gran Canaria 25K | R16 | hard | Angelique Kerber | 6-0 6-3 |
| 2006-12-11 | Dubai 75K | R32 | hard | Angelique Kerber | 6-3 6-7(5) 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.