Diego Cristin defeated Guillermo Bujniewicz 6-0 6-2 in the Argentina F12 round of 16 on clay. The upset overturned the form book — Guillermo Bujniewicz came in leading the head-to-head 1–0. Diego Cristin claimed a first win over Guillermo Bujniewicz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-11-10 | Argentina F16 | R32 | clay | Guillermo Bujniewicz | 6-7(5) 6-0 2-0 |