Singles
2021 Biella Challenger Indoor IV
Champion	Daniel Masur
Runner-up	Matthias Bachinger
Score	6–3, 6–7(8–10), 7–5

Andreas Seppi was the defending champion^[1] but lost in the second round to Matthias Bachinger.

Daniel Masur won the title after defeating Bachinger 6–3, 6–7^(8–10), 7–5 in the final.

Seeds

Draw

Finals

	Semifinals							Final
		Illya Marchenko	3	3
	Q	Daniel Masur	6	6
								Q	Daniel Masur	6	68	7
								Q	Matthias Bachinger	3	710	5
	Q	Matthias Bachinger	7	6
	8	Benjamin Bonzi	5	4

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	L Pouille	6	78
	Alt	Q Halys	2	66				1	L Pouille	4	3
		I Marchenko	6	7					I Marchenko	6	6
	WC	F Cobolli	3	5												I Marchenko	710	6
	WC	S Napolitano	65	6	4										7	G Barrère	68	1
	Alt	Z Kolář	77	0	6			Alt	Z Kolář	2	4
		A Vukic	5	65				7	G Barrère	6	6
	7	G Barrère	7	77																			I Marchenko	3	3
	4	Y Sugita	64	77	3																	Q	D Masur	6	6
	Q	D Masur	77	63	6			Q	D Masur	7	64	6
	Q	J Forejtek	6	62	6			Q	J Forejtek	5	77	4
	PR	D Brown	3	77	4										Q	D Masur	77	6
		S Stakhovsky	7	5	6											S Stakhovsky	63	4
	WC	M Gigante	5	7	2				S Stakhovsky	7	3	77
		M-A Hüsler	6	77					M-A Hüsler	5	6	65
	5	Y Uchiyama	2	63

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	I Ivashka	3	7	4
		Y Maden	6	5	6				Y Maden	3	4
		S Ofner	6	6					S Ofner	6	6
	LL	N Kuhn	2	2												S Ofner	65	0r
	Q	M Bachinger	77	2	6										Q	M Bachinger	77	1
	Q	A Santillan	64	6	4			Q	M Bachinger	6	7
	LL	J Sock	6	3	3			3	A Seppi	3	5
	3	A Seppi	4	6	6																	Q	M Bachinger	7	6
	8	B Bonzi	65	6	6																	8	B Bonzi	5	4
		J Rodionov	77	4	4			8	B Bonzi	77	77
	Alt	T Kamke	6	6				Alt	T Kamke	62	63
		E Ymer	2	2											8	B Bonzi	6	77
		B Tomic	77	6												M Bourgue	3	64
		R Marcora	65	1					B Tomic	3	2
		M Bourgue	7	4	6				M Bourgue	6	6
	2	Y Hanfmann	5	6	3

References

External links

• Main draw
• Qualifying draw