2021 Biella Challenger Indoor IV
Date	15–21 March
Edition	4th
Draw	32S / 16D
Surface	Hard (indoor)
Location	Biella, Italy
Champions
Singles
Daniel Masur
Doubles
Lloyd Glasspool / Matt Reid
← 2021 · Biella Challenger Indoor · 2022 →

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.

Country	Player	Rank1	Seed
FRA	Lucas Pouille	81	1
GER	Yannick Hanfmann	105	2
ITA	Andreas Seppi	107	3
JPN	Yūichi Sugita	108	4
JPN	Yasutaka Uchiyama	109	5
BLR	Ilya Ivashka	113	6
FRA	Grégoire Barrère	115	7
FRA	Benjamin Bonzi	127	8

• ¹ Rankings are as of 8 March 2021.^[1]

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

• Daniel Masur def. Matthias Bachinger 6–3, 6–7^(8–10), 7–5.

• Lloyd Glasspool / Matt Reid def. Denys Molchanov / Sergiy Stakhovsky 6–3, 6–4.