2024 Estoril Open

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.

Singles

 * 🇵🇱 Hubert Hurkacz def. 🇪🇸 Pedro Martínez, 6–3, 6–4

Doubles

 * 🇪🇨 Gonzalo Escobar / 🇰🇿 Aleksandr Nedovyesov def. 🇫🇷 Sadio Doumbia / 🇫🇷 Fabien Reboul, 7–5, 6–2

Seeds

 * 1 Rankings are as of 18 March 2024

Other entrants
The following players received wildcards into the main draw:
 * 🇧🇷 João Fonseca
 * Henrique Rocha
 * João Sousa

The following players received entry from the qualifying draw:
 * 🇬🇧 Jan Choinski
 * Jaime Faria
 * 🇪🇸 Pablo Llamas Ruiz
 * 🇫🇷 Lucas Pouille

The following players received entry as lucky losers:
 * 🇫🇷 Richard Gasquet
 * 🇪🇸 David Jordà Sanchis

Withdrawals

 * 🇫🇷 Arthur Cazaux → replaced by 🇩🇪 Maximilian Marterer
 * 🇪🇸 Alejandro Davidovich Fokina → replaced by 🇫🇷 Richard Gasquet
 * 🇫🇷 Constant Lestienne → replaced by 🇪🇸 David Jordà Sanchis

Seeds

 * Rankings are as of 18 March 2024

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Jaime Faria / Henrique Rocha
 * 🇧🇷 João Fonseca / João Sousa

Withdrawals

 * 🇧🇷 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