Singles
2005 U.S. Men's Clay Court Championships
2004 Champion	Tommy Haas
Final
Champion	Andy Roddick
Runner-up	Sébastien Grosjean
Score	6–2, 6–2
Details
Draw	32
Seeds	8
Events
Singles Doubles
← 2004 · U.S. Men's Clay Court Championships · 2006 →

The 2005 U.S. Men's Clay Court Championships – Singles was an event of the 2005 U.S. Men's Clay Court Championships professional tennis tournament played on outdoor clay courts in Houston, Texas in the United States and was part of the International Series of the 2005 ATP Tour. The tournament was held from April 18 through April 25, 2006. The singles draw comprised 32 players and eight of them were seeded. Third-seeded Tommy Haas was the defending champion but lost in the quarterfinals to Jürgen Melzer. First-seeded Andy Roddick won the singles title after a 6–2, 6–2 win in the final against sixth-seeded Sébastien Grosjean.

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

Key

	First round							Second round							Quarterfinals							Semifinals							Final
	1	A Roddick	6	6
	Q	M Boeker	2	3				1	A Roddick	78	6
		M Fish	1	4					R Ginepri	66	4
		R Ginepri	6	6											1	A Roddick	6	6
	LL	P Goldstein	6	77											8	L Horna	4	1
		J Vaněk	1	64				LL	P Goldstein	1	79	5
		T Enqvist	4	3				8	L Horna	6	67	7
	8	L Horna	6	6																		1	A Roddick	6	6
	3	T Haas	6	7																		7	J Melzer	1	2
		K Vliegen	3	5				3	T Haas	77	6
		A Popp	3	64					J Morrison	64	2
		J Morrison	6	77											3	T Haas	6	2	4
	Q	N Okun	6	7											7	J Melzer	2	6	6
		R Mello	4	5				Q	N Okun	6	2	5
		M Puerta	3	3				7	J Melzer	2	6	7
	7	J Melzer	6	6																									1	Andy Roddick	6	6
	LL	A García	4	4																									6	S Grosjean	2	2
		K Kim	6	6					K Kim	61	2
	Q	N Lapentti	6	6				Q	N Lapentti	77	6
		T Zíb	3	2											Q	N Lapentti	6	1	77
		I Minář	2	5											WC	J Blake	4	6	63
	WC	J Blake	6	7				WC	J Blake	6	6
		A Dupuis	6	6					A Dupuis	4	1
	4	N Massú	4	0																		Q	N Lapentti	1	65
	6	S Grosjean	4	6	7																	6	S Grosjean	6	77
		B Phau	6	3	5			6	S Grosjean	6	5	6
		Ó Hernández	6	7					Ó Hernández	4	7	2
	Q	A Bogomolov Jr.	1	5											6	S Grosjean	4	6	6
		Á Calatrava	6	6											WC/2	A Agassi	6	1	2
	WC	D Young	1	4					Á Calatrava	6	4	5
		M Tabara	2	65				WC/2	A Agassi	3	6	7
	WC/2	A Agassi	6	77

• Main draw
• Qualifying draw