Singles
2021 Banja Luka Challenger
Champion	Juan Manuel Cerúndolo
Runner-up	Nikola Milojević
Score	6–3, 6–1

Tallon Griekspoor was the defending champion^[1] but chose not to defend his title.

Juan Manuel Cerúndolo won the title after defeating Nikola Milojević 6–3, 6–1 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Andrej Martin	2	4
	4	Nikola Milojević	6	6
								4	Nikola Milojević	3	1
								2	Juan Manuel Cerúndolo	6	6
	3	Tomás Martín Etcheverry	3	3
	2	Juan Manuel Cerúndolo	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Martin	0
		M Guinard	0r					1	A Martin	6	7
	Q	J Mridha	6	6				Q	J Mridha	3	5
		D Stricker	2	3											1	A Martin	77	6
	WC	Dražen Petrović	1	0												C Gómez-Herrera	62	3
		C Gómez-Herrera	6	6					C Gómez-Herrera	7	6
		N Álvarez	1	2				5	S Nagal	5	3
	5	S Nagal	6	6																		1	A Martin	2	4
	4	N Milojević	6	6																		4	N Milojević	6	6
	WC	Vladan Tadić	0	3				4	N Milojević	6	1
		P Krstin	6	3	6				P Krstin	1	1r
		N Moreno de Alboran	2	6	2										4	N Milojević	6	6
		D Kuzmanov	3	6	6										7	Z Kolář	3	0
		A Shevchenko	6	4	1				D Kuzmanov	5	2
		M Zekić	3	1				7	Z Kolář	7	6
	7	Z Kolář	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	D Petrović	6	64	2
	WC	M Topo	4	77	6			WC	M Topo	6	3	77
		N Fatić	7	4	1				V Sachko	1	6	65
		V Sachko	5	6	6										WC	M Topo	3	66
	Q	M Cuevas	2	4											3	TM Etcheverry	6	78
		N Serdarušić	6	6					N Serdarušić	6	64	1
	Q	David Poljak	2	5				3	TM Etcheverry	4	77	6
	3	TM Etcheverry	6	7																		3	TM Etcheverry	3	3
	8	V Kopřiva	3	6	65																	2	JM Cerúndolo	6	6
		M Bašić	6	4	77				M Bašić	2	4
		C-h Tseng	6	6					C-h Tseng	6	6
		A Vatutin	1	4												C-h Tseng	2	0
		M Pecotić	4	6	77										2	JM Cerúndolo	6	6
	Q	M Tepavac	6	3	60				M Pecotić
		M Jaziri	6	3	4			2	JM Cerúndolo	w/o
	2	JM Cerúndolo	1	6	6

References

External links

• Main draw
• Qualifying draw