Guillermo Alcorta Olarra defeated Marco Viola 6-2 6-3 in the Italy F33 round of 32 on clay. The upset overturned the form book — Marco Viola came in leading the head-to-head 1–0. Guillermo Alcorta Olarra claimed a first win over Marco Viola in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-27 | Spain F14 | R32 | clay | Marco Viola | 6-2 6-2 |