Singles
2003 Grand Prix de Tennis de Lyon
Champion	Rainer Schüttler
Runner-up	Arnaud Clément
Score	7–5, 6–3

Paul-Henri Mathieu was the defending champion but lost in the first round to Rainer Schüttler.

Schüttler won in the final 7–5, 6–3 against Arnaud Clément.

Seeds

Draw

Finals

	Semifinals							Final
	1	Rainer Schüttler	6	3	7
		Mikhail Youzhny	3	6	5
								1	Rainer Schüttler	7	6
									Arnaud Clément	5	3
	3	Paradorn Srichaphan	2	3
		Arnaud Clément	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Schüttler	6	6
		P-H Mathieu	2	2				1	R Schüttler	4	77	7
		N Lapentti	2	63					I Ljubičić	6	62	5
		I Ljubičić	6	77											1	R Schüttler	77	6
	Q	X Malisse	5	6	6										Q	X Malisse	62	4
	SE	A Pavel	7	3	4			Q	X Malisse	6	6
	Q	T Enqvist	79	77				Q	T Enqvist	3	4
	6	W Ferreira	67	63																		1	R Schüttler	6	3	7
	4	F Mantilla	3	62																			M Youzhny	3	6	5
		M Youzhny	6	77					M Youzhny	1	77	6
		R Nadal	3	5					D Hrbatý	6	61	2
		D Hrbatý	6	7												M Youzhny	77	6
		R Sluiter	65	3												R Ginepri	63	2
		R Ginepri	77	6					R Ginepri	4	6	6
	SE	C Saulnier	7	6				SE	C Saulnier	6	3	4
	5	M Fish	5	3

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	M Safin	1	4
		F Santoro	6	6					F Santoro	6	5	6
	WC	À Corretja	63	65				Q	M Rosset	3	7	4
	Q	M Rosset	77	77												F Santoro	6	3	64
		O Rochus	3	77	6										3	P Srichaphan	1	6	77
	WC	T Ascione	6	64	3				O Rochus	3	2
		D Sánchez	1	1				3	P Srichaphan	6	6
	3	P Srichaphan	6	6																		3	P Srichaphan	2	3
	8	Y Kafelnikov	2	3																			A Clément	6	6
		F Vicente	6	6					F Vicente	1	4
		A Clément	6	6					A Clément	6	6
		F Saretta	3	4												A Clément	6	6
	Q	H Arazi	67	7	77										Q	H Arazi	3	4
		R Štěpánek	79	5	65			Q	H Arazi	6	6
	WC	N Mahut	4	6	r			WC	N Mahut	2	4
	2	S Grosjean	6	3

References

• 2003 Grand Prix de Tennis de Lyon Main Draw
• 2003 Grand Prix de Tennis de Lyon Qualifying Draw