Oscar Sabate Bretos defeated Ralph Grambow 6-3 7-6 in the Greece F2 round of 32 on hard. The upset overturned the form book — Ralph Grambow came in leading the head-to-head 1–0. Oscar Sabate Bretos claimed a first win over Ralph Grambow in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-06-26 | Germany F6 | R32 | clay | Ralph Grambow | 1-6 6-3 6-2 |