Singles
2005 Grand Prix de Tennis de Lyon
Champion	Andy Roddick
Runner-up	Gaël Monfils
Score	6–3, 6–2

Robin Söderling was the defending champion, but did not participate this year.

Andy Roddick won the tournament, beating Gaël Monfils 6–3, 6–2 in the final.

Seeds

Draw

Finals

	Semifinals							Final
	1	Andy Roddick	6	77
		Fabrice Santoro	4	65
								1	Andy Roddick	6	6
									Gaël Monfils	3	2
		Gaël Monfils	6	7
		Sébastien Grosjean	4	5

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Roddick	7	6
	WC	T Ascione	5	3				1	A Roddick	77	6
	Q	N Mahut	6	7				Q	N Mahut	65	3
	WC	J Benneteau	4	5											1	A Roddick	6	6
	Q	G Carraz	1	4											7	M Ančić	4	4
	Q	T Enqvist	6	6				Q	T Enqvist	77	65	4
		J Blake	2	65				7	M Ančić	64	77	6
	7	M Ančić	6	77																		1	A Roddick	6	77
	4	I Ljubičić	65	5																			F Santoro	4	65
		V Spadea	77	7					V Spadea	6	6
		X Malisse	66	3				WC	M Llodra	4	3
	WC	M Llodra	78	6												V Spadea	2	2
		F Santoro	6	7												F Santoro	6	6
		T Dent	3	5					F Santoro	6	6
		P-H Mathieu	5						P-H Mathieu	1	4
	8	R Ginepri	2r

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	D Ferrer	4	0
	Q	M Gicquel	6	6				Q	M Gicquel	6	6
		D Sanguinetti	65	6	6				D Sanguinetti	3	2
		F López	77	4	4										Q	M Gicquel	4	1
		G Monfils	6	5	6											G Monfils	6	6
		J Hernych	4	7	3				G Monfils	6	6
		A Clément	3	6	3			3	G Gaudio	4	3
	3	G Gaudio	6	4	6																		G Monfils	6	7
	5	T Robredo	2	7	6																		S Grosjean	4	5
		N Lapentti	6	5	4			5	T Robredo	5	3
		S Grosjean	4	6	6				S Grosjean	7	6
		V Hănescu	6	3	4											S Grosjean	6	77
		N Djokovic	77	6												O Rochus	3	64
		R Mello	65	4					N Djokovic	64	5
		O Rochus	4	7	6				O Rochus	77	7
	2	M Puerta	6	5	3

References

• Main Draw
• Qualifying Draw