Alexander Flock defeated Guillermo Olaso 6-7 7-5 6-1 in the Spain F11 round of 16 on clay. The upset overturned the form book — Guillermo Olaso came in leading the head-to-head 1–0. Alexander Flock claimed a first win over Guillermo Olaso in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-04-21 | Spain F16 | QF | clay | Guillermo Olaso | 1-6 6-4 3-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.