Singles
2004 Allianz Suisse Open Gstaad
Final
Champion	Roger Federer
Runner-up	Igor Andreev
Score	6–2, 6–3, 5–7, 6–3
Events
Singles Doubles
← 2003 · Allianz Suisse Open Gstaad · 2005 →

Jiří Novák was the defending champion but lost in the quarterfinals to Potito Starace.

Roger Federer won in the final 6–2, 6–3, 5–7, 6–3 against Igor Andreev.

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

• NB: The Final was the best of 5 sets while all other rounds were the best of 3 sets.

	Final
	1	Roger Federer	6	6	5	6
		Igor Andreev	2	3	7	3

	First round							Second round							Quarterfinals							Semifinals
	1	R Federer	6	6
		T Behrend	1	1				1	R Federer	65	6	77
		Ó Hernández	3	78	3				I Karlović	77	3	64
		I Karlović	6	66	6										1	R Federer	6	5	6
	WC	I Heuberger	4	6	3											R Štěpánek	1	7	4
		R Štěpánek	6	1	6				R Štěpánek	6	1	6
	WC	M Rosset	77	6				WC	M Rosset	4	6	3
	5	A Pavel	65	4																		1	R Federer	6	3	6
	4	J Novák	6	6																		Q	P Starace	3	6	3
		J Acasuso	3	3				4	J Novák	3	6	6
		A Montañés	65	77	6				A Montañés	6	3	3
	Q	M Chiudinelli	77	62	4										4	J Novák	4	3
		L Burgsmüller	64	2											Q	P Starace	6	6
		V Hanescu	77	6					V Hanescu	6	63	61
	Q	P Starace	6	3	6			Q	P Starace	3	77	77
	7	D Sánchez	2	6	3

	First round							Second round							Quarterfinals							Semifinals
	6	D Ferrer	2	6	6
		T Berdych	6	3	4			6	D Ferrer	3	62
		C Rochus	6	2	4				F Mantilla	6	77
		F Mantilla	3	6	6											F Mantilla	1	6	2
		F Mayer	7	6											3	R Schüttler	6	4	6
		A Portas	5	3					F Mayer	3	2
	WC	M Kratochvil	4	6	3			3	R Schüttler	6	6
	3	R Schüttler	6	1	6																	3	R Schüttler	2	6	66
	8	A Costa	6	77																			I Andreev	6	3	78
		B Ulihrach	4	65				8	A Costa	2	4
	Q	A Seppi	6	4	2				I Andreev	6	6
		I Andreev	3	6	6											I Andreev	6	6
	Q	S Wawrinka	65	4												R Ramírez Hidalgo	3	4
		R Ramírez Hidalgo	77	6					R Ramírez Hidalgo	6	6
		S Koubek	77	6					S Koubek	3	4
	2	J C Ferrero	65	4

• 2004 Allianz Suisse Open Gstaad Draw