Estefania Donnet defeated Tatiana Bua 6-1 6-4 in the Asuncion 10K round of 16 on clay. The upset overturned the form book — Tatiana Bua came in leading the head-to-head 2–0, but Estefania Donnet had been the form player, winning 2 of their last 4 on clay. Estefania Donnet claimed a first win over Tatiana Bua in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-14 | Buenos Aires 10K | R16 | clay | Tatiana Bua | 2-6 7-5 7-6(6) |
| 2009-04-20 | Buenos Aires 10K | QF | clay | Tatiana Bua | 7-6(3) 6-2 |