Guillermo Olaso defeated Sergio Gutierrez Ferrol 6-4 3-6 6-2 in the Spain F26 round of 32 on clay. The upset overturned the form book — Sergio Gutierrez Ferrol came in leading the head-to-head 2–1. Guillermo Olaso narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-10-09 | Spain F33 | SF | clay | Guillermo Olaso | 2-6 6-1 6-2 |
| 2010-10-18 | Spain F37 | F | clay | Sergio Gutierrez Ferrol | 1-6 6-4 6-2 |
| 2008-01-14 | Spain F2 | R32 | clay | Sergio Gutierrez Ferrol | 6-2 6-3 |
Averages over each player's completed matches in the selected window (39 vs 63). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About