2021 Poznań Open

Country	Player	Rank1	Seed
ESP	Bernabé Zapata Miralles	121	1
NED	Botic van de Zandschulp	128	2
SUI	Henri Laaksonen	132	3
FRA	Hugo Gaston	155	4
CZE	Zdeněk Kolář	179	5
FRA	Enzo Couacaud	180	6
KAZ	Dmitry Popko	187	7
ARG	Guido Andreozzi	198	8

• ¹ Rankings are as of 19 July 2021.^[1]

The following players received wildcards into the singles main draw:

• Leo Borg
• Daniel Michalski
• Aleksander Orlikowski

The following player received entry into the singles main draw as a special exempt:

• Nicolás Kicker

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

• Pedro Cachin
• Jonáš Forejtek

The following players received entry from the qualifying draw:

• João Domingues
• Elmar Ejupovic
• David Poljak
• Alexander Shevchenko

The following players received entry as lucky losers:

• Evan Furness
• Miljan Zekić

• Bernabé Zapata Miralles def. Jiří Lehečka 6–3, 6–2.

• Zdeněk Kolář / Jiří Lehečka def. Karol Drzewiecki / Aleksandar Vukic 6–4, 3–6, [10–5].