Andrea Koch Benvenuto defeated Carla Beltrami 7-6 6-0 in the Mazatlan Sin 10K qualifying round on hard. The upset overturned the form book — Carla Beltrami came in leading the head-to-head 2–1, but Andrea Koch Benvenuto had been the form player, winning 4 of their last 4 on hard. Andrea Koch Benvenuto narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-13 | Buenos Aires 10K | R16 | clay | Andrea Koch Benvenuto | 6-3 6-2 |
| 2009-03-23 | Lima 10K | R16 | clay | Carla Beltrami | 6-4 1-6 6-1 |
| 2008-11-10 | Santiago 10K | QF | clay | Carla Beltrami | 6-3 2-6 6-1 |