Martin Vilarrubi defeated Diego Cristin 6-2 2-6 6-3 in the Argentina F4 qualifying round on clay. The upset overturned the form book — Diego Cristin came in leading the head-to-head 1–0, but Martin Vilarrubi had been the form player, winning 3 of their last 7 on clay. Martin Vilarrubi claimed a first win over Diego Cristin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-11-20 | Uruguay F3 | QF | clay | Diego Cristin | 6-2 6-2 |