Horacio Zeballos defeated Diego Cristin 6-3 6-2 in the Argentina F7 round of 16 on clay. The upset overturned the form book — Diego Cristin came in leading the head-to-head 4–0. Horacio Zeballos claimed a first win over Diego Cristin in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-04-24 | Argentina F4 | R16 | clay | Diego Cristin | 2-6 6-2 7-6(1) |
| 2006-04-10 | Uruguay F1 | QF | clay | Diego Cristin | 0-6 6-2 6-4 |
| 2006-03-06 | Venezuela 1 2 | R16 | hard | Diego Cristin | 6-3 6-3 |
| 2005-05-02 | Argentina F4 | R16 | clay | Diego Cristin | 4-6 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.