Guillermo Bujniewicz defeated Agustin Picco 7-5 7-6 in the Argentina F6 round of 16 on clay. The upset overturned the form book — Agustin Picco came in leading the head-to-head 1–0, but Guillermo Bujniewicz had been the form player, winning 5 of their last 10 on clay. Guillermo Bujniewicz claimed a first win over Agustin Picco in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-28 | Argentina F17 | QF | clay | Agustin Picco | 6-3 3-6 6-4 |