Vivienne Vierin defeated Nastja Kolar 6-2 7-6 in the Katowice 25K round of 32 on clay. The result followed the form book — Vivienne Vierin came in leading the head-to-head 1–0. Vivienne Vierin extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-08-24 | Velenje 10K | R16 | clay | Vivienne Vierin | 6-4 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.