2021 IBG Prague Open

The 2021 IBG Prague Open was a professional tennis tournament played on clay courts. It was part of the 2021 ATP Challenger Tour. It took place in Prague, Czech Republic between 23 and 29 August 2021.

Seeds

 * 1 Rankings as of 16 August 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇨🇿 Martin Krumich
 * 🇨🇿 Andrew Paulson
 * 🇨🇿 Daniel Siniakov

The following player received entry into the singles main draw using a protected ranking:
 * 🇮🇹 Matteo Donati

The following players received entry from the qualifying draw:
 * 🇦🇷 Facundo Díaz Acosta
 * 🇧🇾 Uladzimir Ignatik
 * 🇭🇺 Zsombor Piros
 * 🇺🇸 Alex Rybakov

Singles

 * 🇮🇹 Franco Agamenone def. 🇬🇧 Ryan Peniston 6–3, 6–1.

Doubles

 * 🇷🇴 Victor Vlad Cornea / Petros Tsitsipas def. 🇨🇿 Martin Krumich / 🇨🇿 Andrew Paulson 6–3, 3–6, [10–8].