2021 Argentina Open

The 2021 Argentina Open was a men's tennis tournament played on outdoor clay courts. It was the 24th edition of the ATP Buenos Aires event and part of the ATP Tour 250 series of the 2021 ATP Tour. It took place in Buenos Aires, Argentina, from 1–7 March 2021.

Singles

 * 🇦🇷 Diego Schwartzman defeated 🇦🇷 Francisco Cerúndolo, 6–1, 6–2.

Doubles

 * 🇧🇦 Tomislav Brkić / 🇷🇸 Nikola Ćaćić defeated Ariel Behar / 🇪🇨 Gonzalo Escobar, 6–3, 7–5.

Seeds

 * 1 Rankings are as of February 22, 2021

Other entrants
The following players received wildcards into the singles main draw:
 * 🇦🇷 Thiago Agustín Tirante
 * 🇦🇷 Facundo Díaz Acosta
 * Holger Vitus Nødskov Rune

The following players received special exemptions into the singles main draw:
 * 🇦🇷 Facundo Bagnis
 * 🇦🇷 Juan Manuel Cerúndolo

The following players received entry from the qualifying draw:
 * 🇦🇷 Francisco Cerúndolo
 * 🇸🇰 Lukáš Klein
 * 🇪🇸 Jaume Munar
 * 🇮🇳 Sumit Nagal

Withdrawals

 * Before the tournament
 * Pablo Cuevas → replaced by 🇮🇹 Gianluca Mager
 * 🇪🇸 Pedro Martínez → replaced by 🇸🇰 Andrej Martin
 * 🇦🇷 Guido Pella → replaced by 🇪🇸 Roberto Carballés Baena

Seeds

 * 1 Rankings are as of February 22, 2021

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇦🇷 Francisco Cerúndolo / 🇦🇷 Federico Coria
 * 🇦🇷 Facundo Díaz Acosta / 🇦🇷 Thiago Agustín Tirante

Withdrawals

 * Before the tournament
 * 🇮🇹 Marco Cecchinato / 🇦🇷 Guido Pella → replaced by 🇪🇸 Roberto Carballes Baena / 🇮🇹 Salvatore Caruso
 * Pablo Cuevas / 🇦🇹 Oliver Marach → replaced by 🇦🇹 Oliver Marach / 🇻🇪 Luis David Martínez
 * 🇪🇸 Pablo Andújar / 🇪🇸 Pedro Martinez → replaced by 🇪🇸 Pablo Andújar / 🇪🇸 Jaume Munar
 * During the tournament
 * 🇸🇪 André Göransson / 🇧🇷 Thiago Monteiro