Guillermo Olaso advanced when Marc Fornell Mestres retired 6-1 3-1 in the Spain F37 qualifying round. Guillermo Olaso claimed a first win over Marc Fornell Mestres in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-10 | Spain F37 | QF | clay | Marc Fornell Mestres | 6-3 7-5 |
| 2008-03-10 | Spain F10 | QF | clay | Marc Fornell Mestres | 6-2 7-5 |
| 2006-08-14 | Spain F26 | QF | clay | Marc Fornell Mestres | 6-1 6-1 |
| 2006-07-17 | Spain F23 | R32 | clay | Marc Fornell Mestres | 6-3 6-2 |
Averages over each player's completed matches in the selected window (39 vs 35). 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