2021 Knoxville Challenger – Singles

Michael Mmoh was the defending champion but lost in the semifinals to Daniel Altmaier.

Singles
2021 Knoxville Challenger
Champion	Christopher Eubanks
Runner-up	Daniel Altmaier
Score	6–3, 6–4

Main article: 2021 Knoxville Challenger

Christopher Eubanks won the title after defeating Altmaier 6–3, 6–4 in the final.

Seeds

1. Tennys Sandgren (first round)
2. Daniel Altmaier (final)
3. Vasek Pospisil (first round)
4. Mitchell Krueger (second round)
5. Jack Sock (quarterfinals)
6. J. J. Wolf (first round)
7. Dmitry Popko (first round)
8. Bjorn Fratangelo (semifinals)

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
	8	Bjorn Fratangelo	5	5
		Christopher Eubanks	7	7
									Christopher Eubanks	6	6
								2	Daniel Altmaier	3	4
		Michael Mmoh	6	3	4
	2	Daniel Altmaier	3	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	T Sandgren	6	63	64
	Alt	P Polansky	3	77	77			Alt	P Polansky	6	62	0r
	WC	Em Nava	6	6				WC	Em Nava	2	77	0
	Q	D Young	3	2											WC	Em Nava	4	4
	Q	G Brouwer	5	6	7										8	B Fratangelo	6	6
	Q	JC Aragone	7	2	5			Q	G Brouwer	3	6	3
		Yo Watanuki	4	65				8	B Fratangelo	6	3	6
	8	B Fratangelo	6	77																		8	B Fratangelo	5	5
	3	V Pospisil	6	2	3																		C Eubanks	7	7
		C Eubanks	2	6	6				C Eubanks	6	2	77
		G Soeda	6	78					G Soeda	3	6	64
	Alt	M Jaziri	4	66												C Eubanks	6	711
		J Jung	6	6											Alt	C Harrison	3	69
		J Kubler	4	1					J Jung	6	63	2r
	Alt	C Harrison	6	6				Alt	C Harrison	3	77	4
	6	J. J. Wolf	2	3

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	D Popko	4	5
	Q	A McHugh	6	7				Q	A McHugh	6	6
		A Vukic	3	6	5				S Kozlov	4	4
		S Kozlov	6	4	7										Q	A McHugh	6	3	1
		Y Uchiyama	5	3												M Mmoh	3	6	6
		M Mmoh	7	6					M Mmoh	77	1	6
	PR	T Ito	64	3				4	M Krueger	64	6	2
	4	M Krueger	77	6																			M Mmoh	6	3	4
	5	J Sock	77	7																		2	D Altmaier	3	6	6
	WC	A Kovacevic	64	5				5	J Sock	6	77
		P Gunneswaran	6	77					P Gunneswaran	3	61
		M Torpegaard	2	62											5	J Sock	6	5	62
		B Rola	6	77											2	D Altmaier	3	7	77
		T-S Kwiatkowski	3	65					B Rola	63	4
	WC	A Walton	3	2				2	D Altmaier	77	6
	2	D Altmaier	6	6

External links

• Main draw
• Qualifying draw