2021 Poznań Open

The 2021 Poznań Open was a professional tennis tournament played on clay courts. It was the seventeenth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place at the Park Tenisowy Olimpia in Poznań, Poland from 26 July to 1 August 2021.

Seeds

 * 1 Rankings are as of 19 July 2021.

Other entrants
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

Singles

 * 🇪🇸 Bernabé Zapata Miralles def. 🇨🇿 Jiří Lehečka 6–3, 6–2.

Doubles

 * 🇨🇿 Zdeněk Kolář / 🇨🇿 Jiří Lehečka def. 🇵🇱 Karol Drzewiecki / 🇦🇺 Aleksandar Vukic 6–4, 3–6, [10–5].