Guillermo Bujniewicz defeated Alejandro Fabbri 3-6 7-5 6-1 in the Argentina F15 round of 16 on clay. The upset overturned the form book — Alejandro Fabbri came in leading the head-to-head 1–0. Guillermo Bujniewicz claimed a first win over Alejandro Fabbri in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-08-02 | Argentina F15 | R32 | clay | Alejandro Fabbri | 6-3 6-1 |