2021 Belgrade Challenger – Men's doubles

Men's doubles
2021 Belgrade Challenger
Champions	Guillermo Durán Andrés Molteni
Runners-up	Tomislav Brkić Nikola Ćaćić
Score	6–4, 6–4

This was the first of the three tournaments held in Belgrade for the 2021 tennis season. Belgrade also hosted a joint ATP/WTA tournament.^[1]

Guillermo Durán and Andrés Molteni won the title after defeating Tomislav Brkić and Nikola Ćaćić 6–4, 6–4 in the final.

	First round							Quarterfinals							Semifinals							Final
	1	S González D Sharan	3	3
		J Erlich A Vasilevski	6	6					J Erlich A Vasilevski	6	6
		L Glasspool H Heliövaara	6	4	[5]				A Sitak D Vega Hernández	1	1
		A Sitak D Vega Hernández	2	6	[10]											J Erlich A Vasilevski	6	5	[9]
	4	N Monroe J-P Smith	7	4	[0]											G Durán A Molteni	3	7	[11]
		G Durán A Molteni	5	6	[10]				G Durán A Molteni	6	6
		A Begemann A Vavassori	7	6					A Begemann A Vavassori	2	4
		N Lammons J Withrow	5	3																			G Durán A Molteni	6	6
	WC	H Međedović M Topo	5	63																		3	T Brkić N Ćaćić	4	4
		R Jebavý I Zelenay	7	77					R Jebavý I Zelenay	66	3
	WC	V Troicki M Zekić	4	2				3	T Brkić N Ćaćić	78	6
	3	T Brkić N Ćaćić	6	6											3	T Brkić N Ćaćić	6	78
	WC	M Miladinović M Tepavac	3	2												F Bagnis F Cerúndolo	0	66
		A Göransson J O'Mara	6	6					A Göransson J O'Mara	3	3
		F Bagnis F Cerúndolo	4	711	[11]				F Bagnis F Cerúndolo	6	6
	2	L Bambridge D Inglot	6	69	[9]

• Main draw