2021 JSM Challenger of Champaign–Urbana – Singles

J. J. Wolf was the defending champion^[1] but lost in the semifinals to Stefan Kozlov.

Urbana – Singles
2021 JSM Challenger of Champaign–Urbana
Champion	Stefan Kozlov
Runner-up	Aleksandar Vukic
Score	5–7, 6–3, 6–4

Main article: 2021 JSM Challenger of Champaign–Urbana

Kozlov won the title after defeating Aleksandar Vukic 5–7, 6–3, 6–4 in the final.

Seeds

1. Daniel Altmaier (second round)
2. Mitchell Krueger (quarterfinals)
3. J. J. Wolf (semifinals)
4. Aleksandar Vukic (final)
5. Jason Jung (second round)
6. Prajnesh Gunneswaran (first round)
7. Blaž Rola (first round)
8. Stefan Kozlov (champion)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
		Yosuke Watanuki	68	4
	4	Aleksandar Vukic	710	6
								4	Aleksandar Vukic	7	3	4
								8	Stefan Kozlov	5	6	6
	3	J. J. Wolf	2	3
	8	Stefan Kozlov	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	D Altmaier	6	6
		M Jaziri	3	4				1	D Altmaier	2	1
		A Galarneau	4	6	0				Yo Watanuki	6	6
		Yo Watanuki	6	4	6											Yo Watanuki	6	6
		P Krstin	7	7											Q	B Shelton	2	1
	Q	A Kadhe	5	5					P Krstin	6	0	1
	Q	B Shelton	3	6	6			Q	B Shelton	4	6	6
	7	B Rola	6	4	4																		Yo Watanuki	68	4
	4	A Vukic	6	6																		4	A Vukic	710	6
		T-l Wu	3	3				4	A Vukic	6	6
	WC	A Kovacevic	5	6	65			Q	G Brouwer	4	4
	Q	G Brouwer	7	3	77										4	A Vukic	6	6
		G Soeda	6	6												G Soeda	2	2
		T-S Kwiatkowski	1	4					G Soeda	6	5	6
		M Torpegaard	2	6	4			5	J Jung	4	7	4
	5	J Jung	6	3	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	P Gunneswaran	5	1
	WC	V Kirkov	7	6				WC	V Kirkov	6	6
		Em Nava	3	65					N Chappell	2	3
		N Chappell	6	77											WC	V Kirkov	3	2
		K Uchida	6	3											3	J. J. Wolf	6	6
		Y Uchiyama	4	1r					K Uchida	3	4
		T Ito	3	6	3			3	J. J. Wolf	6	6
	3	J. J. Wolf	6	3	6																	3	J. J. Wolf	2	3
	8	S Kozlov	3	6	6																	8	S Kozlov	6	6
		JC Aragone	6	3	4			8	S Kozlov	6	6
	Q	K Smith	5					Q	K Smith	3	1
		M Mmoh	3r												8	S Kozlov	6	6
	WC	Ezekiel Clark	6	3	3										2	M Krueger	4	4
		C Harrison	4	6	6				C Harrison	3	6	4
		N Mejía	3	3				2	M Krueger	6	1	6
	2	M Krueger	6	6