Men's singles
2021 Belgrade Challenger
Champion	Roberto Carballés Baena
Runner-up	Damir Džumhur
Score	6–4, 7–5

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]

Roberto Carballés Baena won the title after defeating Damir Džumhur 6–4, 7–5 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Roberto Carballés Baena	3	6	6
		Liam Broady	6	2	3
								1	Roberto Carballés Baena	6	7
									Damir Džumhur	4	5
		Damir Džumhur	3	6	6
		Jozef Kovalík	6	3	3

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Carballés Baena	6	77
		A Rinderknech	4	64				1	R Carballés Baena	6	6
	Q	M Trungelliti	6	6				Q	M Trungelliti	2	4
		D Petrović	3	2											1	R Carballés Baena	79	6
	SE	B Rola	6	2											SE	B Rola	67	1
	Q	A Giannessi	4	0r				SE	B Rola	6	6
	SE	G Oliveira	0r					8	B Bonzi	2	2
	8	B Bonzi	4																			1	R Carballés Baena	3	6	6
	3	DE Galán	5	6	4																		L Broady	6	2	3
		S Ofner	7	3	6				S Ofner	6	1	5
		L Broady	6	6					L Broady	4	6	7
		N Milojević	3	4												L Broady	6	62	6
		B Nakashima	67	6	6											B Nakashima	4	77	4
	Q	E Benchetrit	79	1	0				B Nakashima	6	6
		T Griekspoor	67	4				7	H Dellien	2	2
	7	H Dellien	79	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	T Daniel	6	7
	WC	M Miladinović	1	5				6	T Daniel	6	6
	Q	M Bachinger	7	4	0r				A Hoang	4	2
		A Hoang	5	6	0										6	T Daniel	4	4
		D Džumhur	4	6	6											D Džumhur	6	6
	WC	P Krstin	6	2	3				D Džumhur	6	6
		M Cressy	5	6	2			4	P Kohlschreiber	4	3
	4	P Kohlschreiber	7	4	6																		D Džumhur	3	6	6
	5	F Cerúndolo	66	1																			J Kovalík	6	3	3
		J Kovalík	78	6					J Kovalík	6	77
		E Donskoy	4	3					F Gaio	0	64
		F Gaio	6	6												J Kovalík	2	6	6
		O Otte	3	6	3										2	F Bagnis	6	4	4
	WC	H Međedović	6	1	6			WC	H Međedović	2	2
		J Rodionov	6	1	2			2	F Bagnis	6	6
	2	F Bagnis	2	6	6

References

External links

• Main draw
• Qualifying draw