Singles
2004 Heineken Open
Final
Champion	Dominik Hrbatý
Runner-up	Rafael Nadal
Score	4–6, 6–2, 7–5
Details
Draw	32 (4 Q / 3 WC )
Seeds	8
Events
Singles Doubles
← 2003 · ATP Auckland Open · 2005 →

Gustavo Kuerten was the defending champion of the singles event at the Heineken Open tennis tournament, held in Auckland, New Zealand, but lost in the semifinals to Dominik Hrbatý.

Hrbatý won in the final 4–6, 6–2, 7–5 against Rafael Nadal, on his first ATP tour level final.^[1]

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

	First round							Second round							Quarterfinals							Semifinals							Final
	1	G Coria	77	6
		N Kiefer	64	3				1	G Coria
	WC	M Nielsen	3	2					D Hrbatý	w/o
		D Hrbatý	6	6												D Hrbatý	6	3	6
		L Horna	4	3											Q	P Kohlschreiber	1	6	3
	Q	P Kohlschreiber	6	6				Q	P Kohlschreiber	77	6
		R Štěpánek	5	3				6	G Gaudio	63	1
	6	G Gaudio	7	6																			D Hrbatý	6	6
	3	G Kuerten	67	77	7																	3	G Kuerten	3	2
	WC	À Corretja	79	63	5			3	G Kuerten	6	6
		A Martín	6	6					A Martín	2	4
		S Koubek	4	4											3	G Kuerten	6	77
	Q	F Hemmes Jr.	6	6											5	V Spadea	2	64
		R Söderling	2	3				Q	F Hemmes Jr.	1	2
		T Martin	3	4				5	V Spadea	6	6
	5	V Spadea	6	6																										Dominik Hrbatý	4	6	7
	8	J Nieminen	1	4																										Rafael Nadal	6	2	5
		F Santoro	6	6					F Santoro	2	4
		G Carraz	6	63	6				G Carraz	6	6
		K Beck	4	77	3											G Carraz	1r
	WC	S Rea	2	1												R Nadal	2
	Q	M Ančić	6	6				Q	M Ančić	60	66
		R Nadal	77	6					R Nadal	77	78
	4	S Schalken	62	4																			R Nadal	6	6
	7	F González	3	4																		2	J Novák	1	3
		R Sluiter	6	6					R Sluiter	77	6
		D Sánchez	77	6					D Sánchez	63	3
		J-M Gambill	65	3												R Sluiter	6	4	4
	Q	G Müller	7	63	6										2	J Novák	4	6	6
		N Lapentti	5	77	1			Q	G Müller	64	2
		X Malisse	67	77	3			2	J Novák	77	6
	2	J Novák	79	64	6

• Singles draw
• Qualifying Singles draw