The 2021 Braga Open was a professional tennis tournament played on clay courts. It was the third edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Braga, Portugal between 20 and 26 September 2021.

Singles main-draw entrants

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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:

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

The following players received entry from the qualifying draw:

The following player received entry as a lucky loser:

Alex Rybakov

^ "Rankings – Singles – ATP Tour – Tennis". ATP Tour.