Stephanie Theiler defeated Yasmine Guimaraes 7-6 6-4 in the Ribeirao Preto 10K round of 32 on clay. The upset overturned the form book — Yasmine Guimaraes came in leading the head-to-head 1–0, but Stephanie Theiler had been the form player, winning 2 of their last 6 on clay. Stephanie Theiler claimed a first win over Yasmine Guimaraes in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-17 | Goiania 10K | R32 | clay | Yasmine Guimaraes | 6-4 6-2 |