2025 Clube Tenis Porto Challenger

Country	Player	Rank1	Seed
BRA	Thiago Seyboth Wild	140	1
NED	Guy den Ouden	157	2
POR	Henrique Rocha	168	3
ARG	Alex Barrena	229	4
SWE	Elias Ymer	233	5
KAZ	Dmitry Popko	239	6
ARG	Genaro Alberto Olivieri	259	7
POR	Frederico Ferreira Silva	262	8

• ¹ Rankings are as of 18 August 2025.^[1]

The following players received wildcards into the singles main draw:

• Pedro Araújo
• Francisco Rocha
• Henrique Rocha

The following player received entry into the singles main draw through the Next Gen Accelerator programme:

• Gilles-Arnaud Bailly

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

• Alex Hernández
• Maxim Mrva
• Robert Strombachs

The following players received entry from the qualifying draw:

• Max Alcalá Gurri
• David Jordà Sanchis
• Maxwell McKennon
• Filip Pieczonka
• Tiago Torres
• Olle Wallin

• Guy den Ouden def. Gilles-Arnaud Bailly 6–4, 6–2.

• Szymon Kielan / Filip Pieczonka def. Ivan Sabanov / Matej Sabanov 6–2, 6–4.