2021 Braga Open

Country	Player	Rank1	Seed
BRA	Thiago Monteiro	92	1
JPN	Taro Daniel	112	2
FRA	Hugo Gaston	118	3
SRB	Nikola Milojević	152	4
GER	Cedrik-Marcel Stebe	168	5
ITA	Alessandro Giannessi	174	6
POR	Frederico Ferreira Silva	184	7
CAN	Steven Diez	203	8

• ¹ Rankings are as of 13 September 2021.^[1]

The following players received wildcards into the singles main draw:

• Pedro Araújo
• Tiago Cação
• Luís Faria

The following players received entry into the singles main draw using protected rankings:

• Filippo Baldi
• Joris De Loore

The following players received entry from the qualifying draw:

• Peter Heller
• Santiago Rodríguez Taverna
• Nikolás Sánchez Izquierdo
• Kaichi Uchida

The following player received entry as a lucky loser:

• Alex Rybakov

• Thiago Monteiro def. Nikola Milojević 7–5, 7–5.

• Nuno Borges / Francisco Cabral def. Jesper de Jong / Bart Stevens 6–3, 6–7^(4–7), [10–5].