2023 Open de Oeiras II

Country	Player	Rank1	Seed
ARG	Pedro Cachin	68	1
FRA	Hugo Gaston	110	2
MDA	Radu Albot	112	3
ECU	Emilio Gómez	116	4
ARG	Facundo Bagnis	123	5
AUS	Aleksandar Vukic	127	6
ARG	Facundo Díaz Acosta	134	7
AUS	Rinky Hijikata	139	8

• ¹ Rankings are as of 8 May 2023.^[1]

The following players received wildcards into the singles main draw:

• João Domingues
• Frederico Ferreira Silva
• Pedro Sousa

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

• Adrian Andreev
• Federico Delbonis

The following players received entry from the qualifying draw:

• Ulises Blanch
• Alessandro Giannessi
• Manuel Guinard
• Eduardo Ribeiro
• Nino Serdarušić
• Máté Valkusz

• Facundo Díaz Acosta def. Aleksandar Vukic 6–4, 6–3.

• Luke Johnson / Sem Verbeek def. Jaime Faria / Henrique Rocha 6–7^(6–8), 7–5, [10–6].