Singles
2021 Argentina Open
Champion	Diego Schwartzman
Runner-up	Francisco Cerúndolo
Score	6–1, 6–2
Draw	28 (4 Q / 3 WC )
Seeds	8

Diego Schwartzman defeated Francisco Cerúndolo in the final, 6–1, 6–2 to win the men's singles tennis title at the 2021 Argentina Open.

Casper Ruud was the defending champion^[1] but chose not to participate.

Seeds

The top four seeds receive a bye into the second round.

Draw

Finals

	Semifinals							Final
	1	Diego Schwartzman	6	6
	4	Miomir Kecmanović	0	4
								1	Diego Schwartzman	6	6
								Q	Francisco Cerúndolo	1	2
	Q	Francisco Cerúndolo	77	3	6
	5	Albert Ramos Viñolas	65	6	2

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	D Schwartzman	6	6
		A Martin	4	3				Q	L Klein	4	2
	Q	L Klein	6	6											1	D Schwartzman	6	7
	WC	F Díaz Acosta	65	3											Q	J Munar	2	5
	Q	J Munar	77	6				Q	J Munar	77	6
	SE	F Bagnis	1	3				8	F Tiafoe	64	4
	8	F Tiafoe	6	6																		1	D Schwartzman	6	6
																						4	M Kecmanović	0	4
								4	M Kecmanović	5	6	6
		R Carballés Baena	2	3					T Monteiro	7	3	4
		T Monteiro	6	6											4	M Kecmanović	6	78
		F Delbonis	6	77											7	L Đere	4	66
	SE	JM Cerúndolo	4	62					F Delbonis	61	3
		M Cecchinato	77	2	3			7	L Đere	77	6
	7	L Đere	64	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	P Andújar	6	6
		JI Londero	3	0				6	P Andújar	6	77
		G Mager	77	6					G Mager	4	65
		S Caruso	65	4											6	P Andújar	6	3	2
	Q	F Cerúndolo	6	7											Q	F Cerúndolo	1	6	6
		F Coria	4	5				Q	F Cerúndolo	4	6	6
								3	B Paire	6	3	1
																						Q	F Cerúndolo	77	3	6
	5	A Ramos Viñolas	2	6	6																	5	A Ramos Viñolas	65	6	2
	WC	H Rune	6	4	3			5	A Ramos Viñolas	7	6
		D Koepfer	2	6	6				D Koepfer	5	4
	WC	TA Tirante	6	3	4										5	A Ramos Viñolas	4	6	7
		J Sousa	2	0											Q	S Nagal	6	2	5
	Q	S Nagal	6	6				Q	S Nagal	6	6
								2	C Garín	4	3

Qualifying

Qualifying draw

First qualifier

	First round							Second round							Qualifying competition
	1	Jaume Munar	6	65	6
	WC	Nicolás Álvarez	4	77	2
								1	Jaume Munar	5	6	2
									Sebastián Báez	7	3	1r
		Sebastián Báez	6	6
		Alejandro Tabilo	1	0
															1	Jaume Munar	6	6
															7	Daniel Altmaier	3	4
		Facundo Mena	3	4
		Juan Pablo Varillas	6	6
									Juan Pablo Varillas	4	77	5
								7	Daniel Altmaier	6	63	7
		Orlando Luz	4	7	2
	7	Daniel Altmaier	6	5	6

Second qualifier

	First round							Second round							Qualifying competition
	2	Hugo Dellien
		Pedro Sakamoto	w/o
									Pedro Sakamoto	3	4
								WC	Agustín Velotti	6	6
	WC	Agustín Velotti	7	6
		Guido Andreozzi	5	0
															WC	Agustín Velotti	4	5
															6	Francisco Cerúndolo	6	7
	WC	Hernán Casanova	6	3	3
		Guilherme Clezar	1	6	6
									Guilherme Clezar	6	3	2
								6	Francisco Cerúndolo	2	6	6
		João Menezes	6	4	4
	6	Francisco Cerúndolo	4	6	6

Third qualifier

	First round							Second round							Qualifying competition
	Alt	Carlos Gómez-Herrera	62	6	62
		Sumit Nagal	77	2	77
									Sumit Nagal	6	6
									Mario Vilella Martínez	4	2
		Mario Vilella Martínez	6	7
		Marcelo Tomás Barrios Vera	4	5
																Sumit Nagal	2	6	6
															WC	Nicolás Kicker	6	2	3
	WC	Nicolás Kicker	7	7
		Renzo Olivo	5	5
								WC	Nicolás Kicker	1	78	7
								5	Jozef Kovalík	6	66	5
		Emilio Gómez	5	4
	5	Jozef Kovalík	7	6

Fourth qualifier

	First round							Second round							Qualifying competition
	4	Thiago Seyboth Wild	6	77
	Alt	Christian Lindell	1	64
								4	Thiago Seyboth Wild	3	5
									Lukáš Klein	6	7
		Andrea Collarini	4	5
		Lukáš Klein	6	7
																Lukáš Klein	6	6
																Ernesto Escobedo	2	3
		João Domingues	3	6	6
		Tomás Martín Etcheverry	6	0	3
									João Domingues	1	6	3
									Ernesto Escobedo	6	1	6
		Ernesto Escobedo	7	77
	8	Leonardo Mayer	5	65

References

External links

• Main draw
• Qualifying draw