Diego Lopez defeated Guillermo Bujniewicz 6-0 6-3 in the Argentina F15 round of 32 on clay. The upset overturned the form book — Guillermo Bujniewicz came in leading the head-to-head 1–0. Diego Lopez claimed a first win over Guillermo Bujniewicz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-08-14 | Argentina F12 | R32 | clay | Guillermo Bujniewicz | 7-5 7-6(5) |