Marcos Jimenez Letrado defeated Frederik Nielsen 5-7 6-3 7-5 in the Portugal F2 round of 16 on hard. The upset overturned the form book — Frederik Nielsen came in leading the head-to-head 1–0. Marcos Jimenez Letrado claimed a first win over Frederik Nielsen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-09-05 | Spain F23 | QF | hard | Frederik Nielsen | 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.