Martin Vilarrubi defeated Miha Gregorc 7-5 7-5 in the Guatemala F1 round of 32 on hard. The upset overturned the form book — Miha Gregorc came in leading the head-to-head 1–0. Martin Vilarrubi claimed a first win over Miha Gregorc in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-01-09 | El Salvador F1 | R16 | clay | Miha Gregorc | 3-6 7-6(7) 6-0 |