Guillermo Bujniewicz defeated Mauricio Estivariz 7-6 6-0 in the Argentina F14 round of 32 on clay. The result followed the form book — Guillermo Bujniewicz came in leading the head-to-head 2–1. Guillermo Bujniewicz extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-28 | Argentina F17 | R32 | clay | Guillermo Bujniewicz | 6-4 6-4 |
| 2007-09-10 | Bolivia F1 | R32 | clay | Mauricio Estivariz | 6-2 6-3 |
| 2007-04-23 | Argentina F1 | R32 | clay | Guillermo Bujniewicz | 6-2 6-7(4) 7-6(2) |