Diego Cubas defeated Lucas Engel 3-6 6-4 6-3 in the Brazil F6 round of 16 on clay. The upset overturned the form book — Lucas Engel came in leading the head-to-head 2–0. Diego Cubas claimed a first win over Lucas Engel in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-08-28 | Brazil F9 | QF | clay | Lucas Engel | 6-4 6-2 |
| 2004-08-30 | Brazil F5 | R32 | clay | Lucas Engel | 6-4 6-0 |