Lucas Engel defeated Diego Hartfield 7-6 3-6 7-6 in the Colombia F4 round of 32 on clay. The upset overturned the form book — Diego Hartfield 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 Diego Hartfield in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-05-02 | Colombia F4 | SF | clay | Diego Hartfield | 7-6(5) 6-1 |
| 2001-06-25 | Brazil F5 | R16 | clay | Diego Hartfield | 7-6(2) 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.