2025 Argentina Open – Singles

João Fonseca defeated Francisco Cerúndolo in the final, 6–4, 7–6^(7–1) to win the singles tennis title at the 2025 Argentina Open.^[1] He saved two match points (in the quarterfinals against Mariano Navone) en route to his first ATP Tour title. Fonseca was the youngest Brazilian man and the second-youngest South American in the Open Era, behind only Guillermo Pérez Roldán in 1987, and the first man born in 2006, to win a top-level title.^[2] He entered the tournament through the Next Gen Accelerator Program introduced by the ATP in 2024, being the first player entered under the system to win a tour-level title. Fonseca was the first Brazilian man to win the Argentina Open title since Gustavo Kuerten in 2001, and the lowest-ranked champion (world No. 99) in tournament history.^[3]

Facundo Díaz Acosta was the defending champion,^[4][5] but lost in the first round to Thiago Seyboth Wild.^[6]

This tournament marked the final professional appearance of former world No. 8 Diego Schwartzman.^[7] He defeated seventh seed Nicolás Jarry in the first round,^[8] before losing in the second round to Pedro Martínez.^[9]

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

	Semifinals							Final
	5	Francisco Cerúndolo	6	6
		Pedro Martínez	2	4
								5	Francisco Cerúndolo	4	61
									João Fonseca	6	77
	Q	Laslo Djere	63	7	1
		João Fonseca	77	5	6

	First round							Second round							Quarterfinals							Semifinals
								1	A Zverev	6	6
		R Carballés Baena	68	5					D Lajović	4	4
		D Lajović	710	7											1	A Zverev	6	3	2
	Q	RA Burruchaga	64	7	5										5	F Cerúndolo	3	6	6
	Q	JM Cerúndolo	77	5	7			Q	JM Cerúndolo	2	3
		L Darderi	4	4				5	F Cerúndolo	6	6
	5	F Cerúndolo	6	6																		5	F Cerúndolo	6	6
																							P Martínez	2	4
								3	L Musetti	6	6
		C Moutet	7	6					C Moutet	2	3
	LL	S Nagal	5	2											3	L Musetti
		D Džumhur	6	2	63											P Martínez	w/o
		P Martínez	0	6	77				P Martínez	6	6
	WC	D Schwartzman	712	4	6			WC	D Schwartzman	2	2
	7	N Jarry	610	6	3

	First round							Second round							Quarterfinals							Semifinals
	6	S Báez	6	6
	WC	C Ugo Carabelli	4	4				6	S Báez	3	4
		F Díaz Acosta	6	2	3				T Seyboth Wild	6	6
		T Seyboth Wild	3	6	6											T Seyboth Wild	63	3
		A Müller	3	3											Q	L Djere	77	6
	Q	L Djere	6	6				Q	L Djere	2	6	77
								4	A Tabilo	6	1	62
																						Q	L Djere	63	7	1
	8	TM Etcheverry	3	3																			J Fonseca	77	5	6
		J Fonseca	6	6					J Fonseca	2	6	6
		H Gaston	3	2				LL	F Coria	6	4	2
	LL	F Coria	6	6												J Fonseca	3	6	7
		M Navone	6	6												M Navone	6	4	5
	WC	F Comesaña	4	4					M Navone	6	77
								2	H Rune	1	62

	First round							Qualifying competition
	1	Francesco Passaro	6	6
		Daniel Elahi Galán	1	4
								1	Francesco Passaro	2	78	6
								WC	Juan Bautista Torres	6	66	1
	WC	Juan Bautista Torres	6	3	7
	8	Tseng Chun-hsin	1	6	5

	First round							Qualifying competition
	2	Thiago Monteiro	7	3	68
	Alt	Felipe Meligeni Alves	5	6	710
								Alt	Felipe Meligeni Alves	6	2	63
								Alt	Román Andrés Burruchaga	2	6	77
	Alt	Román Andrés Burruchaga	6	6
	Alt	Gustavo Heide	3	4

	First round							Qualifying competition
	3	Federico Coria	5	710	4
		Thiago Agustín Tirante	7	68	1r
								3	Federico Coria	2	4
								6	Laslo Djere	6	6
	Alt	Marco Trungelliti	4	4
	6	Laslo Djere	6	6

	First round							Qualifying competition
	4	Sumit Nagal	64	6	77
	WC	Juan Pablo Ficovich	77	2	64
								4	Sumit Nagal	6	65	0r
									Juan Manuel Cerúndolo	3	77	1
		Juan Manuel Cerúndolo	6	77
	5	Jaime Faria	1	61

• Main draw
• Qualifying draw