Oscar Serrano defeated David Marrero 6-3 3-6 6-3 in the Spain F28 round of 32 on clay. The upset overturned the form book — David Marrero came in leading the head-to-head 1–0. Oscar Serrano claimed a first win over David Marrero in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-01-31 | Spain F1 | R16 | clay | David Marrero | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.