Monica Niculescu defeated Maria Penkova 7-5 6-2 in the Portimao 10K semi-final on hard. The upset overturned the form book — Maria Penkova came in leading the head-to-head 1–0. Monica Niculescu claimed a first win over Maria Penkova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-09-11 | Sofia 25K | QF | clay | Maria Penkova | 1-6 6-3 7-6(5) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.