2021 Columbus Challenger – Men's singles

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

Men's singles
2021 Columbus Challenger
Champion	Stefan Kozlov
Runner-up	Max Purcell
Score	4–6, 6–2, 6–4

Main article: 2021 Columbus Challenger

Kozlov won the title after defeating Max Purcell 4–6, 6–2, 6–4 in the final.

Seeds

1. Tennys Sandgren (quarterfinals)
2. Salvatore Caruso (first round, retired)
3. Alex Bolt (quarterfinals)
4. Prajnesh Gunneswaran (second round)
5. Jason Jung (first round)
6. Ernesto Escobedo (first round)
7. J. J. Wolf (semifinals)
8. Mitchell Krueger (first round)

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
	7	J. J. Wolf	6	3	5
		Stefan Kozlov	2	6	7
									Stefan Kozlov	4	6	6
									Max Purcell	6	2	4
		Aleksandar Vukic	63	66
		Max Purcell	77	78

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	T Sandgren	6	6
	LL	A Galarneau	3	2				1	T Sandgren	6	6
	Q	G Brouwer	77	6				Q	G Brouwer	4	4
		D King	61	0											1	T Sandgren	3	6	65
		JC Aragone	4	4											7	J. J. Wolf	6	3	77
	Q	E King	6	6				Q	E King	3	0
		M Sasikumar	3	2				7	J. J. Wolf	6	6
	7	J. J. Wolf	6	6																		7	J. J. Wolf	6	3	5
	4	P Gunneswaran	3	6	7																		S Kozlov	2	6	7
	Q	A Kovacevic	6	3	5			4	P Gunneswaran	1	4
	LL	S Mochizuki	3	77	65				M Torpegaard	6	6
		M Torpegaard	6	63	77											M Torpegaard	6	64	4
		J Kubler	78	6												S Kozlov	2	77	6
		P Polansky	66	4					J Kubler	2	5
		S Kozlov	6	6					S Kozlov	6	7
	8	M Krueger	0	3

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	E Escobedo	4	5
		A Vukic	6	7					A Vukic	77	7
	WC	M Vocel	7	1	63			WC	C Kingsley	64	5
	WC	C Kingsley	5	6	77											A Vukic	7	6
	Q	Y-s Chung	6	4	63										3	A Bolt	5	4
		J-s Nam	3	6	77				J-s Nam	65	4
		N Rubin	65	64				3	A Bolt	77	6
	3	A Bolt	77	77																			A Vukic	63	66
	5	J Jung	3	4																			M Purcell	77	78
		R Peniston	6	6					R Peniston	3	67
	WC	J Tracy	3	2					M Purcell	6	79
		M Purcell	6	6												M Purcell	6	3	6
	Alt	N Chappell	0r													N Mejía	4	6	0
		N Mejía	5						N Mejía	6	0	6
	Alt	D Kelly	6	3				Alt	D Kelly	4	6	2
	2	S Caruso	2	0r