Maria Irigoyen defeated Stephanie Vongsouthi 6-4 6-2 in the Mont-De-Marsan 25K round of 16 on clay. The upset overturned the form book — Stephanie Vongsouthi came in leading the head-to-head 2–0. Maria Irigoyen claimed a first win over Stephanie Vongsouthi in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-21 | Madrid 25K | R32 | hard | Stephanie Vongsouthi | 7-6(3) 6-3 |
| 2009-07-27 | Bad Saulgau 25K | R32 | clay | Stephanie Vongsouthi | 6-1 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.