Lucas Engel defeated Juan Martin Aranguren 7-5 1-6 7-5 in the Brazil F3A round of 16 on clay. The upset overturned the form book — Juan Martin Aranguren came in leading the head-to-head 2–0, but Lucas Engel had been the form player, winning 6 of their last 10 on clay. Lucas Engel claimed a first win over Juan Martin Aranguren in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-04-11 | Chile F2 | R32 | clay | Juan Martin Aranguren | 5-7 7-6(3) 6-1 |
| 2003-10-13 | Colombia F2 | R32 | clay | Juan Martin Aranguren | 6-1 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.