Singles
2004 Western & Southern Financial Group Masters
Final
Champion	Andre Agassi
Runner-up	Lleyton Hewitt
Score	6–3, 3–6, 6–2
Details
Draw	64
Seeds	16
Events
Singles Doubles
← 2003 · Western & Southern Financial Group Masters · 2005 →

Andre Agassi defeated Lleyton Hewitt in the final, 6–3, 3–6, 6–2 to win the men's singles tennis title at the 2004 Cincinnati Masters.

Andy Roddick was the defending champion, but lost in the semifinals to Agassi.

	Quarterfinals							Semifinals							Final
		Fabrice Santoro	2	3
		Tommy Robredo	6	6
									Tommy Robredo	3	2
								10	Lleyton Hewitt	6	6
	14	Marat Safin	4	4
	10	Lleyton Hewitt	6	6
															10	Lleyton Hewitt	3	6	2
															11	Andre Agassi	6	3	6
	11	Andre Agassi	714	6
	4	Carlos Moyá	612	3
								11	Andre Agassi	7	62	77
								2	Andy Roddick	5	77	62
	WC	Tommy Haas	3	3
	2	Andy Roddick	6	6

	First round							Second round							Third round							Quarterfinals
	1	R Federer	6	67	4
		D Hrbatý	1	79	6				D Hrbatý	78	3	3
		J Björkman	2	6	6				J Björkman	66	6	6
		I Labadze	6	2	1											J Björkman	0	3
		R Ginepri	3	66												F Santoro	6	6
		F Santoro	6	78					F Santoro	7	6
		M Youzhny	6	3	6				M Youzhny	5	3
	13	N Massú	3	6	3																		F Santoro	2	3
	9	G Gaudio	6	6																			T Robredo	6	6
	WC	J-M Gambill	4	2				9	G Gaudio	6	63	4
		T Enqvist	6	3	2			Q	G Rusedski	4	77	6
	Q	G Rusedski	3	6	6										Q	G Rusedski	64	62
		T Dent	64	3												T Robredo	77	77
		T Robredo	77	6					T Robredo	77	4	6
		A Clément	4	4				7	J C Ferrero	65	6	4
	7	J C Ferrero	6	6

	First round							Second round							Third round							Quarterfinals
	LL	T Reid	4	4
		F López	6	6					F López	69	4
	Q	W Moodie	77	67	69			Q	I Karlović	711	6
	Q	I Karlović	62	79	711										Q	I Karlović	64	77	4
		J Melzer	63	2											14	M Safin	77	63	6
	WC	J Morrison	77	6				WC	J Morrison	4	4
		J Novák	3	0				14	M Safin	6	6
	14	M Safin	6	6																		14	M Safin	4	4
	10	L Hewitt	6	6																		10	L Hewitt	6	6
	WC	A Bogomolov Jr.	2	4				10	L Hewitt	6	6
		Y-H Lu	4	6	3				G Kuerten	3	4
		G Kuerten	6	3	6										10	L Hewitt	6	6
		H Arazi	63	7	5										5	T Henman	1	4
		V Spadea	77	5	3r				H Arazi	6	3	5
		Y El Aynaoui	1	0				5	T Henman	4	6	7
	5	T Henman	6	6

	First round							Second round							Third round							Quarterfinals
	17	J I Chela	6	4	77
		R Nadal	4	6	63			17	J I Chela	2	6	6
		F González	6	6					F González	6	3	2
	Q	D Tursunov	4	4											17	J I Chela	3	3
	SE	T Johansson	77	77											11	A Agassi	6	6
	LL	G Carraz	63	63				SE	T Johansson	1	6	1
		M Fish	6	63	1			11	A Agassi	6	3	6
	11	A Agassi	4	77	6																	11	A Agassi	714	6
	16	A Pavel	65	3																		4	C Moyà	612	3
	LL	W Arthurs	77	6				LL	W Arthurs	6	78
		M Llodra	4	61					M Zabaleta	2	66
		M Zabaleta	6	77											LL	W Arthurs	65	6	65
		X Malisse	6	65	65										4	C Moyà	77	4	77
		I Ljubičić	4	77	77				I Ljubičić	4	6	4
	Q	A Parmar	6	5	2			4	C Moyà	6	4	6
	4	C Moyà	3	7	6

	First round							Second round							Third round							Quarterfinals
	8	R Schüttler	3	6	4
	WC	T Haas	6	1	6			WC	T Haas	6	6
		S Sargsian	2	6	7				S Sargsian	3	3
	Q	M Kratochvil	6	2	5										WC	T Haas	6	5	6
		L Horna	77	77												R Söderling	3	7	4
		F Verdasco	64	63					L Horna	2	3
		R Söderling	3	6	6				R Söderling	6	6
	12	S Grosjean	6	3	4																	WC	T Haas	3	3
	15	P Srichaphan	6	5	6																	2	A Roddick	6	6
		D Ferrer	3	7	3			15	P Srichaphan	6	6
	Q	D Norman	4	3					S Schalken	3	4
		S Schalken	6	6											15	P Srichaphan	2	3
		J Johansson	3	62											2	A Roddick	6	6
		N Kiefer	6	77					N Kiefer	4	4
		M Mirnyi	77	65	3			2	A Roddick	6	6
	2	A Roddick	65	77	6

• 2004 Western & Southern Financial Group Masters Draw