Simona Ionescu defeated Oana Georgeta Simion 6-3 6-3 in the Mamaia 25K qualifying round of 64 on clay. The upset overturned the form book — Oana Georgeta Simion came in leading the head-to-head 1–0, but Simona Ionescu had been the form player, winning 6 of their last 10 on clay. Simona Ionescu claimed a first win over Oana Georgeta Simion in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-06-17 | Bucharest 10K | R32 | clay | Oana Georgeta Simion | 6-4 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.