Men's singles
2004 AIG Japan Open Tennis Championships
Champion	Jiří Novák
Runner-up	Taylor Dent
Score	5–7, 6–1, 6–3
Draw	48 (6 Q / 4 WC )
Seeds	16

Rainer Schüttler was the defending champion, but did not participate.

Seeds

All seeds receive a bye into the second round.

Draw

Finals

	Quarterfinals							Semifinals							Final
	1	Lleyton Hewitt	7	6
	9	Cyril Saulnier	5	1
								1	Lleyton Hewitt	4	6	2
								5	Jiří Novák	6	4	6
	4	Paradorn Srichaphan	4	4
	5	Jiří Novák	6	6
															5	Jiří Novák	5	6	6
															7	Taylor Dent	7	1	3
		Bohdan Ulihrach	7	6
	Q	Björn Phau	5	4
									Bohdan Ulihrach	6	4	1
								7	Taylor Dent	4	6	6
	7	Taylor Dent	6	4	6
	16	Gilles Müller	4	6	2

Top half

Section 1

	First round							Second round							Third round							Quarterfinals
								1	L Hewitt	6	3	6
		G Weiner	4	3				WC	G Motomura	0	6	1
	WC	G Motomura	6	6											1	L Hewitt	63	6	6
		A García	66	64											WC	T Suzuki	77	2	4
	WC	T Suzuki	78	77				WC	T Suzuki	77	3	7
								15	J Hernych	6	64	5
																						1	L Hewitt	7	6
																						9	C Saulnier	5	1
								9	C Saulnier	2	6	6
	Q	K Pless	62	60					N Thomann	6	1	4
		N Thomann	77	77											9	C Saulnier	66	77	77
		C Rochus	6R												8	T Johansson	78	63	65
		J Gimelstob	6						J Gimelstob	4	4
								8	T Johansson	6	6

Section 2

	First round							Second round							Third round							Quarterfinals
								4	P Srichaphan	2	77	6
		Y-h Lu	61	61					H Levy	6	63	4
		H Levy	77	77											4	P Srichaphan	6	4
		A Peya	6	3	4										Q	M Chiudinelli	3	1R
	Q	M Chiudinelli	4	6	6			Q	M Chiudinelli	6	77
								14	D van Scheppingen	4	63
																						4	P Srichaphan	4	4
																						5	J Novák	6	6
								11	R Mello	5	6	77
		J Vacek	3	4					F Saretta	7	2	65
		F Saretta	6	6											11	R Mello	1	2
		G García López	6	2	6										5	J Novák	6	6
		L Burgsmüller	4	6	3				G García López	5	2
								5	J Novák	7	6

Bottom half

Section 3

	First round							Second round							Third round							Quarterfinals
								6	G Cañas	6	62	3
		K Carlsen	5	2				Q	M Kohlmann	4	77	6
	Q	M Kohlmann													Q	M Kohlmann	4	2
		B Ulihrach	6	6												B Ulihrach	6	6
		N Okun	4	1					B Ulihrach	6	77
								12	J Nieminen	3	65
																							B Ulihrach	7	6
																						Q	B Phau	5	4
								13	J-M Gambill	77	6
	Q	S Iwabuchi	6	6					S Iwabuchi	65	1
	WC	T Terachi	1	3											13	J-M Gambill	61	6	2
	Q	B Phau	6	6											Q	B Phau	7	2	6
	WC	T Iwami	4	1				Q	B Phau	6	6
								3	A Pavel	2	1

Section 4

	First round							Second round							Third round							Quarterfinals
								7	T Dent	6	6
		M Philippoussis	3	4					T Zíb	3	4
		T Zíb	6	6											7	T Dent	7	5	6
		W Arthurs	6	7											10	H-T Lee	64	7	3
		J-R Lisnard	4	5					W Arthurs	2	62
								10	H-T Lee	6	77
																						7	T Dent	6	4	6
																						16	G Müller	4	6	2
								16	G Müller	6	6
		A Bogomolov	6	3	77				A Bogomolov	3	1
		J Tipsarević	3	6	62										16	G Müller	7	3	6
	Q	YT Wang	6	77											2	D Nalbandian	64	6	4
		J Morrison	3	61					YT Wang	6	64	2
								2	D Nalbandian	3	7	6

References

• Draw
• Qualifying Draw