Diego Cubas defeated Alexandre Bonatto 5-7 6-3 6-4 in the Brazil F9 round of 16 on clay. The upset overturned the form book — Alexandre Bonatto came in leading the head-to-head 1–0. Diego Cubas claimed a first win over Alexandre Bonatto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-22 | Brazil F2 | QF | clay | Alexandre Bonatto | 6-3 2-0 |