Vivienne Vierin defeated Karen Barritza 6-4 6-4 in the Petange 100K qualifying round on clay. The upset overturned the form book — Karen Barritza came in leading the head-to-head 1–0. Vivienne Vierin claimed a first win over Karen Barritza in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-10-09 | Rome-Castel Gandolfo 10K | R32 | clay | Karen Barritza | 7-6(2) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.