Erik Csarnakovics defeated Nuno Marques 6-3 2-6 7-5 in the Portugal 2 1 qualifying round on hard. The upset overturned the form book — Nuno Marques came in leading the head-to-head 1–0. Erik Csarnakovics claimed a first win over Nuno Marques in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-10-09 | Portugal 2 3 | R16 | hard | Nuno Marques | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.