Martin Bartonek defeated Nuno Marques 7-5 4-6 6-4 in the Portugal 5 Masters 4 semi-final on clay. The upset overturned the form book — Nuno Marques came in leading the head-to-head 1–0. Martin Bartonek claimed a first win over Nuno Marques in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-11-22 | Portugal 5 Masters 3 | R16 | clay | Nuno Marques | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.