2021 Biella Challenger Indoor IV

The 2021 Biella Challenger Indoor IV was a professional tennis tournament played on hard courts. It was the 4th edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Biella, Italy between 15 and 21 March 2021.

Seeds

 * 1 Rankings are as of 8 March 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇮🇹 Flavio Cobolli
 * 🇮🇹 Matteo Gigante
 * 🇮🇹 Stefano Napolitano

The following player received entry into the singles main draw using a protected ranking:
 * 🇩🇪 Dustin Brown

The following players received entry into the singles main draw as alternates:
 * 🇫🇷 Quentin Halys
 * 🇩🇪 Tobias Kamke
 * 🇨🇿 Zdeněk Kolář

The following players received entry from the qualifying draw:
 * 🇩🇪 Matthias Bachinger
 * 🇨🇿 Jonáš Forejtek
 * 🇩🇪 Daniel Masur
 * 🇦🇺 Akira Santillan

The following players received entry as lucky losers:
 * 🇪🇸 Nicola Kuhn
 * 🇺🇸 Jack Sock

Singles

 * 🇩🇪 Daniel Masur def. 🇩🇪 Matthias Bachinger 6–3, 6–7(8–10), 7–5.

Doubles

 * 🇬🇧 Lloyd Glasspool / 🇦🇺 Matt Reid def. 🇺🇦 Denys Molchanov / 🇺🇦 Sergiy Stakhovsky 6–3, 6–4.