Singles
2003 Canada Masters and the Rogers AT&T Cup
2002 Champion	Guillermo Cañas
Final
Champion	Andy Roddick
Runner-up	David Nalbandian
Score	6–1, 6–3
Events
Singles men women Doubles men women
← 2002 · Canada Masters · 2004 → ← 2002 · Rogers AT&T Cup · 2004 →

Andy Roddick defeated David Nalbandian in the final, 6–1, 6–3 to win the men's singles tennis title at the 2003 Canada Masters.

Guillermo Cañas was the reigning champion, but did not compete that year.

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

	Quarterfinals							Semifinals							Final
	1	Andre Agassi	6	2	3
	8	Rainer Schüttler	2	6	6
								8	Rainer Schüttler	6	2	2
									David Nalbandian	3	6	6
		David Nalbandian	6	6
		Feliciano López	4	4
																David Nalbandian	1	3
															6	Andy Roddick	6	6
		Max Mirnyi	2	63
	3	Roger Federer	6	77
								3	Roger Federer	4	6	63
								6	Andy Roddick	6	3	77
	6	Andy Roddick	77	6
		Karol Kučera	65	3

	First round							Second round							Third round							Quarterfinals
	1	A Agassi	6	6
	WC	F Niemeyer	4	2				1	A Agassi	77	6
		N Davydenko	77	4	6				N Davydenko	63	2
	WC	F Dancevic	63	6	3										1	A Agassi	6	6
		F Santoro	6	3	4											S Larose	4	2
		J Acasuso	2	6	6				J Acasuso	65	6	5
	WC	S Larose	7	77				WC	S Larose	77	1	7
	13	G Kuerten	5	62																		1	A Agassi	6	2	3
	10	J Novák	7	3	6																	8	R Schüttler	2	6	6
		M Ančić	5	6	3			10	J Novák	77	6
		R Štěpánek	63	4					J Blake	65	3
		J Blake	77	6											10	J Novák	5	0
		Y Kafelnikov	1	6	6										8	R Schüttler	7	6
	Q	G Carraz	6	2	4				Y Kafelnikov	1	4
		M Youzhny	2	4				8	R Schüttler	6	6
	8	R Schüttler	6	6

	First round							Second round							Third round							Quarterfinals
	4	C Moyá	64	6	3
		A Clément	77	4	6				A Clément	0	77	5
		V Spadea	6	6					V Spadea	6	65	7
		R Sluiter	3	4												V Spadea	4	2
		J Nieminen	65	65												D Nalbandian	6	6
		D Nalbandian	77	77					D Nalbandian	6	6
		T Henman	6						T Henman	4	4
	14	F González	2	r																			D Nalbandian	6	6
	12	S Schalken	1	1																			F López	4	4
		M Zabaleta	6	6					M Zabaleta	1	1
	Q	K Beck	66	77	6			Q	K Beck	6	6
	Q	M Llodra	78	63	1										Q	K Beck	4	63
		P-H Mathieu	77	6												F López	6	77
	Q	S Draper	65	4					P-H Mathieu	4	6	5
		F López	6						F López	6	3	7
	7	G Coria	3	r

	First round							Second round							Third round							Quarterfinals
	5	L Hewitt	6	6
	Q	B Bryan	2	2				5	L Hewitt	5	77	5
	LL	N Massú	4	64					M Mirnyi	7	64	7
		M Mirnyi	6	77												M Mirnyi	6	6
	WC	D Nestor	3	6	6										11	P Srichaphan	3	2
		R Ginepri	6	3	4			WC	D Nestor	5	4
		A Martín	0	65				11	P Srichaphan	7	6
	11	P Srichaphan	6	77																			M Mirnyi	2	63
	16	T Robredo	6	77																		3	R Federer	6	77
		H-T Lee	4	60				16	T Robredo	6	6
		W Ferreira	4	1r				Q	W Black	0	2
	Q	W Black	6	2											16	T Robredo	4	3
		N Lapentti	5	3											3	R Federer	6	6
		G Rusedski	7	6					G Rusedski	4	3
		G Gaudio	4	6	5			3	R Federer	6	6
	3	R Federer	6	3	7

	First round							Second round							Third round							Quarterfinals
	6	A Roddick	3	6	6
		X Malisse	6	0	2			6	A Roddick	78	6
		A Calleri	7	4	3				J I Chela	66	2
		J I Chela	5	6	6										6	A Roddick	6	6
	Q	R Delgado	77	77											9	S Grosjean	3	3
		I Ljubičić	60	63				Q	R Delgado	3	2
		F Vicente	3	3				9	S Grosjean	6	6
	9	S Grosjean	6	6																		6	A Roddick	77	6
	15	M Verkerk	6	4	7																		K Kučera	65	3
		S Sargsian	2	6	5			15	M Verkerk	68	63
		K Kučera	77	77					K Kučera	710	77
		J-M Gambill	63	63												K Kučera	6	7
		Y El Aynaoui	6	68	6										2	J C Ferrero	3	5
		M Fish	3	710	3				Y El Aynaoui	3	4
	Q	C Saulnier	4	4				2	J C Ferrero	6	6
	2	J C Ferrero	6	6

• 2003 Canada Masters Draw
• 2003 Canada Masters Qualifying Draw