Guillermo Bujniewicz defeated Cristhian Ignacio Benedetti 7-6 2-6 6-0 in the Argentina F17 round of 32 on clay. The upset overturned the form book — Cristhian Ignacio Benedetti came in leading the head-to-head 2–0, but Guillermo Bujniewicz had been the form player, winning 4 of their last 8 on clay. Guillermo Bujniewicz claimed a first win over Cristhian Ignacio Benedetti in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-11-02 | Argentina F22 FUTURES | R16 | clay | Cristhian Ignacio Benedetti | 5-7 6-4 6-1 |
| 2008-08-25 | Argentina F8 | R32 | clay | Cristhian Ignacio Benedetti | 6-3 6-2 |