2025 Estoril Open

The 2025 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 10th edition of the tournament and an ATP Challenger Tour 175 event on the 2025 ATP Challenger Tour (downgraded from ATP 250 status in previous years). It took place at the Clube de Ténis do Estoril in Cascais, Portugal, from 29 April to 4 May 2025.^[1]

2025 Estoril Open
Date	29 April – 4 May
Edition	10th
Category	ATP Challenger Tour
Draw	28S / 16D
Surface	Clay / outdoor
Location	Cascais, Portugal
Venue	Clube de Ténis do Estoril
Champions
Singles
Alex Michelsen
Doubles
Ariel Behar / Joran Vliegen

Singles main draw entrants

Seeds

Country	Player	Rank1	Seed
CAN	Félix Auger-Aliassime	19	1
USA	Alex Michelsen	38	2
POR	Nuno Borges	41	3
USA	Marcos Giron	45	4
SRB	Miomir Kecmanović	47	5
ESP	Pedro Martínez	48	6
CHI	Nicolás Jarry	57	7
BRA	João Fonseca	65	8

• ¹ Rankings are as of 21 April 2025.^[2]

Other entrants

The following players received wildcards into the main draw:

• Félix Auger-Aliassime
• Gastão Elias
• Henrique Rocha

The following players received entry into the singles main draw as alternates:

• Kimmer Coppejans
• Aziz Dougaz
• Yannick Hanfmann
• Dušan Lajović
• Nicolas Moreno de Alboran
• Ethan Quinn

The following players received entry from the qualifying draw:

• Giovanni Fonio
• Andrea Pellegrino
• Alexey Vatutin
• Giulio Zeppieri

The following players received entry as lucky losers:

• Denis Yevseyev
• Bernabé Zapata Miralles

Champions

Singles

Main article: 2025 Estoril Open – Singles

• Alex Michelsen def. Andrea Pellegrino 6–4, 6–4.

Doubles

Main article: 2025 Estoril Open – Doubles

• Ariel Behar / Joran Vliegen def. Francisco Cabral / Lucas Miedler 7–5, 6–3.