David Diaz Ventura defeated Marc Fornell Mestres 6-4 6-3 in the Spain F14 qualifying round on clay. The upset overturned the form book — Marc Fornell Mestres came in leading the head-to-head 3–0. David Diaz Ventura claimed a first win over Marc Fornell Mestres in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-01 | Spain F13 | R32 | clay | Marc Fornell Mestres | 6-2 6-3 |
| 2005-08-15 | Spain F20 | R32 | clay | Marc Fornell Mestres | 6-1 6-4 |
| 2004-08-30 | Spain F21 | QF | clay | Marc Fornell Mestres | 6-1 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.