Guillermo Olaso defeated Andrea Arnaboldi 2-6 7-5 6-4 in the Croatia F11 round of 32 on clay. The upset overturned the form book — Andrea Arnaboldi came in leading the head-to-head 4–0. Guillermo Olaso claimed a first win over Andrea Arnaboldi in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-05-27 | Italy F10 | SF | clay | Andrea Arnaboldi | 6-3 1-6 7-6(10) |
| 2009-02-02 | Spain F4 | QF | clay | Andrea Arnaboldi | 3-6 6-2 6-1 |
| 2008-10-27 | Spain F41 | R16 | clay | Andrea Arnaboldi | 6-4 7-5 |
| 2008-02-11 | Spain F6 | R32 | clay | Andrea Arnaboldi | 6-4 0-6 6-4 |
Averages over each player's completed matches in the selected window (39 vs 200). 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