Guillermo Olaso defeated Pablo Martin Adalia 6-3 7-6 in the Spain F4 qualifying round on clay. The upset overturned the form book — Pablo Martin Adalia came in leading the head-to-head 1–0. Guillermo Olaso claimed a first win over Pablo Martin Adalia in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-03-31 | Spain F13 | R16 | clay | Pablo Martin Adalia | 6-3 3-6 7-6(3) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.