Guillermo Olaso defeated Juan Miguel Such Perez 6-2 6-4 in the Spain F28 qualifying round on clay. The upset overturned the form book — Juan Miguel Such Perez came in leading the head-to-head 2–0. Guillermo Olaso claimed a first win over Juan Miguel Such Perez in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-01-28 | Spain F4 | R32 | clay | Juan Miguel Such Perez | 6-2 6-4 |
| 2006-06-12 | Spain F19 | R32 | hard | Juan Miguel Such Perez | 7-5 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.