Singles
2013 U.S. Men's Clay Court Championships
Final
Champion	John Isner
Runner-up	Nicolás Almagro
Score	6–3, 7–5
Events
Singles Doubles
← 2012 · U.S. Men's Clay Court Championships · 2014 →

Juan Mónaco was the defending champion, but lost to John Isner in the semifinals.
Isner went on to win the title, defeating Nicolás Almagro in the final, 6–3, 7–5.

The top four seeds received a bye into the second round.

	Semifinals							Final
	1	Nicolás Almagro	6	6
	WC	Rhyne Williams	2	1
								1	Nicolás Almagro	3	5
								5	John Isner	6	7
	3	Juan Mónaco	6	4	4
	5	John Isner	1	6	6

	First round							Second round							Quarterfinals							Semifinals
								1	N Almagro	2	6	6
		G Monfils	77	7					G Monfils	6	0	3
		J Blake	65	5											1	N Almagro	6	6
		F Cipolla	4	6	7										7	P Lorenzi	4	4
	Q	F Argüello	6	4	5				F Cipolla	64	1
	Q	G Melzer	2	2				7	P Lorenzi	77	6
	7	P Lorenzi	6	6																		1	N Almagro	6	6
																						WC	R Williams	2	1
								LL	I Karlović	4	77	63
	WC	R Williams	7	7				WC	R Williams	6	65	77
		G Pella	5	5											WC	R Williams	77	1	6
	PR	S Devvarman	65	0												R Ramírez Hidalgo	61	6	4
		R Ramírez Hidalgo	77	6					R Ramírez Hidalgo	6	6
	WC	S Johnson	65	2				6	F Verdasco	3	2
	6	F Verdasco	77	6

	First round							Second round							Quarterfinals							Semifinals
	8	M Russell	2	2
	Q	R Ginepri	6	6				Q	R Ginepri	6	4	6
		M Alund	4	6	6				M Alund	2	6	4
		L Hewitt	6	3	1										Q	R Ginepri	1	0
		J Ouanna	1	2											3	J Mónaco	6	6
		T Smyczek	6	6					T Smyczek	65	1
								3	J Mónaco	77	6
																						3	J Mónaco	6	4	4
	5	J Isner	77	6																		5	J Isner	1	6	6
		R Harrison	64	4				5	J Isner	7	63	77
	WC	J Sock	77	6				WC	J Sock	5	77	63
	Q	B Klahn	63	3											5	J Isner	6	3	6
		R Berankis	63	7	6											R Berankis	3	6	3
		J Levine	77	5	4				R Berankis	6	6
								2	T Haas	3	3

The top five seeds receive a bye into the second round.

1. Ivo Karlović

	First round							Second round							Qualifying competition
								1	Ivo Karlović	6	6
	William Boe-Wiegaard		2	2					Florin Mergea	4	3
	Florin Mergea		6	6											1	Ivo Karlović	4	63
	Nicholas Edlefsen		2	2												Gerald Melzer	6	77
	Roman Borvanov		6	6				Roman Borvanov		7	62	1
		Gerald Melzer	6	6				Gerald Melzer		5	77	6
	8	Alex Kuznetsov	2	4

	First round							Second round							Qualifying competition
								2	Mischa Zverev	2	6	2
		Robby Ginepri	6	6					Robby Ginepri	6	4	6
	WC	Bayo Philips	2	0												Robby Ginepri	77	77
	Michael Venus		5	6	4										5	Peter Polansky	65	63
	Frank Moser		7	4	6				Frank Moser	64	64
								5	Peter Polansky	77	77

	First round							Second round							Qualifying competition
								3	Teymuraz Gabashvili	6	77
	Takanyi Garanganga		6	5	7				Takanyi Garanganga	2	61
	Scott Lipsky		4	7	5										3	Teymuraz Gabashvili	3	2
	Fritz Wolmarans		5	6	3										6	Facundo Argüello	6	6
	Chris Wettengel		7	1	6				Chris Wettengel	3	2
	WC	David Warren	2	3				6	Facundo Argüello	6	6
	6	Facundo Argüello	6	6

	First round							Second round							Qualifying competition
								4	Bradley Klahn	711	6
		Greg Ouellette	6	6					Greg Ouellette	69	4
	WC	Connor Curry	2	2											4	Bradley Klahn	6	6
	Luka Gregorc		7	6												Luka Gregorc	1	4
	Vullnet Tashi		5	1				Luka Gregorc		6	6
		John Peers	5	7	0			John Peers		4	4
	7	Michael Yani	7	5	0r

• Main Draw
• Qualifying Draw