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.
Finals
Singles
- Diego Schwartzman defeated Francisco Cerúndolo, 6–1, 6–2.
Doubles
- Tomislav Brkić / Nikola Ćaćić defeated Ariel Behar / Gonzalo Escobar, 6–3, 7–5.
Singles main draw entrants
Seeds
- 1 Rankings are as of February 22, 2021
Other entrants
The following players received wildcards into the singles main draw:The following players received special exemptions into the singles main draw:
The following players received entry from the qualifying draw:
Withdrawals
;Before the tournament- Pablo Cuevas → replaced by Gianluca Mager
- Pedro Martínez → replaced by Andrej Martin
- Guido Pella → replaced by Roberto Carballés Baena
Doubles main draw entrants
Seeds
Other entrants
The following pairs received wildcards into the doubles main draw: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