Singles
2005 ATP Buenos Aires
Champion	Gastón Gaudio
Runner-up	Mariano Puerta
Score	6–4, 6–4
Draw	32
Seeds	8

Gastón Gaudio defeated Mariano Puerta 6–4, 6–4 to win the 2005 ATP Buenos Aires singles competition. Guillermo Coria was the champion but did not defend his title.

Seeds

Draw

Finals

	Semifinals							Final
	WC	Mariano Puerta	6	77
		José Acasuso	4	65
								WC	Mariano Puerta	4	4
								2	Gastón Gaudio	6	6
		Alberto Martín	3	4
	2	Gastón Gaudio	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	C Moyà	6	77
	Q	P Luczak	3	65				1	C Moyà	6	6
		Á Costa	5	4					J Mónaco	1	2
		J Mónaco	7	6											1	C Moyà	60	3
	Q	J-P Guzmán	2	62											WC	M Puerta	77	6
	WC	M Puerta	6	77				WC	M Puerta	6	6
		L Burgsmüller	6	6					L Burgsmüller	2	0
	6	F Volandri	4	2																		WC	M Puerta	6	77
	LL	G García López	6	6																			J Acasuso	4	65
		D Sánchez	4	3				LL	G García López	4	3
		J Acasuso	6	6					J Acasuso	6	6
		P-H Mathieu	3	2												J Acasuso	6	6
		S Ventura	3	3												N Almagro	3	4
		N Almagro	6	6					N Almagro	64	6	6
		Á Calatrava	3	2				8	M Zabaleta	77	4	4
	8	M Zabaleta	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	J I Chela	5	1
	Q	M López	7	6				Q	M López	6	65	64
		F Mantilla	6	77					F Mantilla	4	77	77
		Ó Hernández	4	60												F Mantilla	7	4	63
		D Ferrer	0r													A Martín	5	6	77
		A Martín	5						A Martín	6	6
		À Corretja	3	1				3	G Cañas	4	3
	3	G Cañas	6	6																			A Martín	3	4
	WC/7	R Nadal	77	6																		2	G Gaudio	6	6
		A Calleri	62	3				WC/7	R Nadal	6	6
	WC	E Massa	65	0					P Starace	1	3
		P Starace	77	6											WC/7	R Nadal	6	0	1
		Montañés	3	6	2										2	G Gaudio	0	6	6
		F Saretta	6	0	6				F Saretta	3	2
	Q	F Luzzi	6	1	3			2	G Gaudio	6	6
	2	G Gaudio	2	6	6

External links

• 2005 ATP Buenos Aires Singles draw
• Doubles draw
• Qualifying Singles draw