Guillermo Olaso defeated David Diaz Ventura 7-6 6-7 6-1 in the Spain F11 round of 32 on clay. The result followed the form book — Guillermo Olaso came in leading the head-to-head 1–0. Guillermo Olaso extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-09-22 | Bosnia & Herzegovina F6 | SF | clay | Guillermo Olaso | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.