2021 Bratislava Open

The 2021 Bratislava Open was a professional tennis tournament played on clay courts. It was the 2nd edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Bratislava, Slovakia between 7 and 13 June 2021.

Seeds

 * 1 Rankings are as of 31 May 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇸🇰 Miloš Karol
 * 🇸🇰 Lukáš Klein
 * 🇸🇰 Alex Molčan

The following player received entry into the singles main draw using a protected ranking:
 * 🇷🇺 Andrey Kuznetsov

The following players received entry from the qualifying draw:
 * Duje Ajduković
 * 🇧🇾 Uladzimir Ignatik
 * 🇨🇿 Vít Kopřiva
 * 🇨🇿 Jiří Lehečka

The following player received entry as a lucky loser:
 * 🇦🇹 Lucas Miedler

Singles

 * Tallon Griekspoor def. 🇦🇷 Sebastián Báez 7–6(8–6), 6–3.

Doubles

 * 🇺🇦 Denys Molchanov / 🇰🇿 Aleksandr Nedovyesov def. Sander Arends / 🇻🇪 Luis David Martínez 7–6(7–5), 6–1.