The 2024 Estoril Open (also known as the Millennium Estoril Open for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts. It was the 9th edition of the tournament and part of the ATP Tour 250 series of the 2024 ATP Tour. It took place at the Clube de Ténis do Estoril in Cascais, Portugal, from 1 to 7 April 2024.[1]
See main article: 2024 Estoril Open – Singles.
Hubert Hurkacz def. 
Pedro Martínez, 6–3, 6–4See main article: 2024 Estoril Open – Doubles.
Gonzalo Escobar / 
Aleksandr Nedovyesov def. 
Sadio Doumbia / Fabien Reboul, 7–5, 6–2| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Norway | Casper Ruud | 8 | 1 | |
| Poland | Hubert Hurkacz | 9 | 2 | |
 Italy | Lorenzo Musetti | 24 | 3 | |
| Spain | ||||
| France | Arthur Fils | 37 | 5 | |
 Serbia | Miomir Kecmanović | 46 | 6 | |
| France | Gaël Monfils | 47 | 7 | |
| Dominik Koepfer | 50 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Arthur Cazaux → replaced by Maximilian Marterer Alejandro Davidovich Fokina → replaced by Richard Gasquet Constant Lestienne → replaced by David Jordà Sanchis| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Belgium | Sander Gillé | Belgium | Joran Vliegen | 56 | 1 | |
| France | Sadio Doumbia | France | Fabien Reboul | 63 | 2 | |
| Ariel Behar |  Czech Republic | Adam Pavlásek | 80 | 3 | ||
| Ecuador | Gonzalo Escobar | Kazakhstan | Aleksandr Nedovyesov | 104 | 4 |
The following pairs received wildcards into the doubles main draw:
Marcelo Demoliner / Marcelo Melo → replaced by Marcelo Demoliner / Sem Verbeek Nicolas Mahut / Édouard Roger-Vasselin → replaced by 
Pedro Cachín / Pedro Martínez Lorenzo Musetti / Andrea Pellegrino → replaced by Dan Added / Grégoire Jacq