2021 Banja Luka Challenger – Singles

Tallon Griekspoor was the defending champion but chose not to defend his title.

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

Main article: 2021 Banja Luka Challenger

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

Seeds

1. Andrej Martin (semifinals)
2. Juan Manuel Cerúndolo (champion)
3. Tomás Martín Etcheverry (semifinals)
4. Nikola Milojević (final)
5. Sumit Nagal (second round)
6. Danilo Petrović (first round)
7. Zdeněk Kolář (quarterfinals)
8. Vít Kopřiva (first round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• SE = Special exempt
• PR = Protected ranking
• ITF = ITF entry
• JE = Junior exempt
• w/o = Walkover
• r = Retired
• d = Defaulted
• SR = Special ranking

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

External links

• Main draw
• Qualifying draw