2023 Aberto da República

Country	Player	Rank1	Seed
CHI	Cristian Garín	88	1
CHI	Tomás Barrios Vera	106	2
BOL	Hugo Dellien	112	3
USA	Aleksandar Kovacevic	117	4
ARG	Thiago Agustín Tirante	121	5
BRA	Thiago Monteiro	131	6
USA	Nicolas Moreno de Alboran	153	7
ARG	Guido Andreozzi	180	8
USA	Oliver Crawford	193	9

• ¹ Rankings are as of 13 November 2023.^[2]

The following players received wildcards into the singles main draw:

• João Fonseca
• Gilbert Klier Júnior
• Eduardo Ribeiro

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

• Benjamin Lock
• Orlando Luz

The following players received entry from the qualifying draw:

• Gonzalo Bueno
• Ignacio Buse
• Wilson Leite
• Fernando Romboli
• Pedro Sakamoto
• Alejandro Tabilo

The following players received entry as lucky losers:

• Mateus Alves
• Blaise Bicknell

• Alejandro Tabilo def. Román Andrés Burruchaga 6–3, 7–6^(8–6).

• Nicolás Barrientos / André Göransson def. Marcelo Demoliner / Rafael Matos 7–6^(7–3), 4–6, [11–9].