Carlos Poch Gradin defeated Guillermo Olaso 7-6 1-6 6-1 in the Spain F9 round of 16 on clay. The upset overturned the form book — Guillermo Olaso came in leading the head-to-head 2–0. Carlos Poch Gradin claimed a first win over Guillermo Olaso in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-03-01 | Spain F7 | QF | clay | Guillermo Olaso | 7-6(3) 1-6 6-4 |
| 2008-01-07 | Spain F1 | SF | clay | Guillermo Olaso | 6-0 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.