Singles
2003 Allianz Suisse Open Gstaad
Final
Champion	Jiří Novák
Runner-up	Roger Federer
Score	5–7, 6–3, 6–3, 1–6, 6–3
Events
Singles Doubles
← 2002 · Allianz Suisse Open Gstaad · 2004 →

Àlex Corretja was the defending champion but lost in the second round to David Sánchez.

Jiří Novák won in the final 5–7, 6–3, 6–3, 1–6, 6–3 against Roger Federer.

This tournament was also notable for being the first ATP tournament in which future Grand Slam Champion Stanislas Wawrinka competed in the main draw. He drew Jean-René Lisnard in the first round and was defeated.

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	7	3	3	6	3
	3	Jiří Novák	5	6	6	1	6

	First round							Second round							Quarterfinals							Semifinals
	1	R Federer	6	64	6
	Q	M López	3	77	3			1	R Federer	6	6
	WC	S Wawrinka	6	1	5				J-R Lisnard	1	2
		J-R Lisnard	2	6	7										1	R Federer	w/o
		D Sánchez	6	7												D Sánchez
		K Beck	4	5					D Sánchez	6	6
		J van Lottum	1	2				WC/7	À Corretja	4	4
	WC/7	À Corretja	6	6																		1	R Federer	6	78
	4	G Gaudio	6	6																		4	G Gaudio	1	66
		K Vliegen	3	4				4	G Gaudio	4	6	6
		L Burgsmüller	6	66	6				L Burgsmüller	6	2	4
		Ž Krajan	2	78	1										4	G Gaudio	6	6
	Q	G Blanco	1	6	3											S Koubek	3	1
		S Koubek	6	1	6				S Koubek	6	6
		A Dupuis	77	77					A Dupuis	1	2
	6	N Davydenko	61	64

	First round							Second round							Quarterfinals							Semifinals
	5	J I Chela	6	6
		A Sá	0	2				5	J I Chela	6	62	77
		F López	6	6					F López	4	77	63
		I Labadze	0	2											6	J I Chela	3	3
		P-H Mathieu	6	6											3	J Novák	6	6
	Q	P Kohlschreiber	3	1					P-H Mathieu	6	2	3
		S Sargsian	3	3				3	J Novák	1	6	6
	3	J Novák	6	6																		3	J Novák	7	6
	8	R Štěpánek	6	6																		8	R Štěpánek	5	1
	Q	H Armando	3	3				8	R Štěpánek	6	77
		T Behrend	4	78	2				M Kratochvil	3	65
		M Kratochvil	6	66	6										8	R Štěpánek	6	6
	WC	M Lammer	3	5											2	R Schüttler	4	2
		C Rochus	6	7					C Rochus	3	66
		W Arthurs	2	3				2	R Schüttler	6	78
	2	R Schüttler	6	6

• 2003 Allianz Suisse Open Gstaad Draw
• 2003 Allianz Suisse Open Gstaad Qualifying Draw