Frederik Nielsen defeated Marcos Jimenez Letrado 6-2 7-5 in the Spain F23 qualifying round on hard. The upset overturned the form book — Marcos Jimenez Letrado came in leading the head-to-head 1–0. Frederik Nielsen claimed a first win over Marcos Jimenez Letrado in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-02-28 | Portugal F2 | R16 | hard | Marcos Jimenez Letrado | 5-7 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.