Singles
2013 Knoxville Challenger
Final
Champion	Tim Smyczek
Runner-up	Peter Polansky
Score	6–4, 6–2
Events
Singles Doubles
← 2012 · Knoxville Challenger · 2014 →

Michael Russell was the defending champion, but retired against Tennys Sandgren in the quarterfinals.
Top seed Tim Smyczek won the title defeating unseeded Canadian Peter Polansky in the final.

	Semifinals							Final
	1	Tim Smyczek	7	77
		Tennys Sandgren	5	63
								1	Tim Smyczek	6	6
									Peter Polansky	4	2
		Peter Polansky	4	6	6
	Q	Takanyi Garanganga	6	1	3

	First round							Second round							Quarterfinals							Semifinals
	1	T Smyczek	6	6
	LL	F Wolmarans	4	4				1	T Smyczek	5	7	6
		S Johnson	6	6					S Johnson	7	5	4
	PR	Laurent Rochette	3	2											1	T Smyczek	6	6
		S Groth	6	6											8	A Kuznetsov	4	3
		J-P Smith	3	3					S Groth	60	6	62
		M Neuchrist	4	3				8	A Kuznetsov	77	2	77
	8	A Kuznetsov	6	6																		1	T Smyczek	7	77
	4	M Russell	6	4	6																		T Sandgren	5	63
	WC	J Jenkins	3	6	4			4	M Russell	6	2	6
	Alt	E Corrie	2	6	6			Alt	E Corrie	4	6	1
		J Hernández	6	2	4										4	M Russell	4	0r
		T Sandgren	6	6												T Sandgren	6	0
		D Molchanov	3	3					T Sandgren	6	6
		R Williams						6	R Harrison	4	3
	6	R Harrison	w/o

	First round							Second round							Quarterfinals							Semifinals
	5	D Young	6	6
		S Myneni	4	2				5	D Young	0	3
		N Langer	1	4				Q	S Singh	6	6
	Q	S Singh	6	6											Q	S Singh	3	3
	Alt	D Rice	64	6	7											P Polansky	6	6
		A Krajicek	77	4	5			Alt	D Rice	4	4
		P Polansky	6	77					P Polansky	6	6
	3/WC	J Sock	4	63																			P Polansky	4	6	6
	7	R Ram	2	77	4																	Q	T Garanganga	6	1	3
	Q	K King	6	65	6			Q	K King	2	4
	Q	T Garanganga	6	6				Q	T Garanganga	6	6
		T Angelinos	4	2											Q	T Garanganga	79	77
	Q	Mitchell Frank	6	6												R de Voest	67	64
	WC	Jarryd Chaplin	4	3				Q	M Frank
		R de Voest	6	78					R de Voest	w/o
	2/Alt	D Kudla	1	66

• Main Draw
• Qualifying Draw