| Date: | 11–17 February |
| Edition: | 22nd |
| Category: | ATP Tour 250 series |
| Prize Money: | $590,745 |
| Draw: | 28S / 16D |
| Surface: | Clay / outdoor |
| Location: | Buenos Aires, Argentina |
| Venue: | Buenos Aires Lawn Tennis Club |
| Champs: |  Marco Cecchinato |
| Champd: |  Máximo González / Horacio Zeballos |
| Main Name: | ATP Buenos Aires |
The 2019 Argentina Open was a men's tennis tournament played on outdoor clay courts. It was the 22nd edition of the ATP Buenos Aires event, and part of the ATP Tour 250 series of the 2019 ATP Tour. It took place in Buenos Aires, Argentina, from February 11 through 17, 2019.[1]
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Austria | Dominic Thiem | 8 | 1 | |
| Italy | Fabio Fognini | 15 | 2 | |
| Italy | Marco Cecchinato | 19 | 3 | |
| Argentina | Diego Schwartzman | 20 | 4 | |
| João Sousa | 39 | 5 | ||
| Nicolás Jarry | 41 | 6 | ||
 Serbia | Dušan Lajović | 42 | 7 | |
 Tunisia | Malek Jaziri | 43 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry as a special exempt:
The following players received entry from the qualifying draw:
Pablo Carreño Busta → replaced by Christian Garín| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Argentina | Máximo González | Argentina | Horacio Zeballos | 64 | 1 | |
| Pablo Cuevas | Spain | Marc López | 80 | 2 | ||
 Brazil | Marcelo Demoliner | Frederik Nielsen | 109 | 3 | ||
 Czech Republic | Roman Jebavý | Argentina | Andrés Molteni | 109 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2019 Argentina Open – Singles.
Marco Cecchinato defeated Diego Schwartzman, 6–1, 6–2See main article: 2019 Argentina Open – Doubles.
Máximo González / Horacio Zeballos defeated Diego Schwartzman / Dominic Thiem, 6–1, 6–1
