2021 Argentina Open – Singles

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.

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

Main article: 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.

1. Diego Schwartzman (champion)
2. Cristian Garín (second round)
3. Benoît Paire (second round)
4. Miomir Kecmanović (semifinals)
5. Albert Ramos Viñolas (semifinals)
6. Pablo Andújar (quarterfinals)
7. Laslo Đere (quarterfinals)
8. Frances Tiafoe (second round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

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

Seeds

1. Jaume Munar (qualified)
2. Hugo Dellien (first round, withdrew)
3. Daniel Elahi Galán (withdrew)
4. Thiago Seyboth Wild (second round)
5. Jozef Kovalík (second round)
6. Francisco Cerúndolo (qualified)
7. Daniel Altmaier (qualifying competition)
8. Leonardo Mayer (first round)

Qualifiers

1. Jaume Munar
2. Francisco Cerúndolo
3. Sumit Nagal
4. Lukáš Klein

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