Guillermo Bujniewicz defeated Juan Manuel Valverde 6-3 3-6 6-2 in the Argentina F4 qualifying round on clay. Guillermo Bujniewicz extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-07 | Argentina F8 | QF | clay | Juan Manuel Valverde | 6-4 7-6(3) |
| 2006-08-07 | Argentina F11 | R16 | clay | Guillermo Bujniewicz | 6-4 6-2 |