Eduarda Piai defeated Nathalia Rossi 6-3 6-3 in the Ribeirao Preto $10K round of 32 on clay. The upset overturned the form book — Nathalia Rossi came in leading the head-to-head 7–1, but Eduarda Piai had been the form player, winning 7 of their last 9 on clay. Eduarda Piai narrowed the head-to-head to 7–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-11-11 | Sao Jose Do Rio Preto 10K | SF | clay | Nathalia Rossi | 6-2 4-6 7-6(2) |
| 2013-09-30 | Asuncion 10K | QF | clay | Eduarda Piai | 6-0 6-3 |
| 2012-08-13 | Trujillo 10K | R16 | clay | Nathalia Rossi | 7-6(4) 6-1 |
| 2011-08-08 | Sao Paulo 10K | QF | clay | Nathalia Rossi | 6-3 6-1 |
| 2011-08-01 | Sao Paulo 10K | R32 | clay | Nathalia Rossi | 6-3 6-3 |
| 2010-10-25 | Itu 10K | QF | clay | Nathalia Rossi | 3-6 7-5 7-5 |
| 2010-09-13 | Itapema 10K | R32 | clay | Nathalia Rossi | 6-3 6-0 |
| 2010-08-09 | Itaparica 10K | R16 | hard | Nathalia Rossi | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.