| Singles | |
|---|---|
| 2019 Argentina Open | |
| Champion |  Marco Cecchinato |
| Runner-up |  Diego Schwartzman |
| Final score | 6–1, 6–2 |
| Draw | 28 (4 Q / 3 WC ) |
| Seeds | 8 |
 |
Dominic Thiem was the defending champion, but lost to Diego Schwartzman in the semifinals. [1]
Marco Cecchinato won the title, defeating Schwartzman in the final, 6–1, 6–2.
The top four seeds received a bye into the second round.
Dominic Thiem (semifinals) Fabio Fognini (second round) Marco Cecchinato (champion) Diego Schwartzman (final)
João Sousa (second round)
Nicolás Jarry (first round)
Dušan Lajović (first round)
Malek Jaziri (first round)| Semifinals | Final | ||||||||||||
| 1 | Dominic Thiem | 6 | 4 | 65 | |||||||||
| 4 | Diego Schwartzman | 2 | 6 | 77 | |||||||||
| 4 | Diego Schwartzman | 1 | 2 | ||||||||||
| 3 | Marco Cecchinato | 6 | 6 | ||||||||||
| 3 | Marco Cecchinato | 6 | 6 | ||||||||||
| Guido Pella | 4 | 2 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | D Thiem | 6 | 6 | ||||||||||||||||||||||||
| Q | F Bagnis | 4 | 2 |  M Marterer | 4 | 4 | |||||||||||||||||||||
| M Marterer | 6 | 6 | 1 | D Thiem | 4 | 6 | 6 | ||||||||||||||||||||
| Q |  M Arévalo | 2 | 1 |  P Cuevas | 6 | 4 | 3 | ||||||||||||||||||||
| P Cuevas | 6 | 6 | P Cuevas | 6 | 7 | ||||||||||||||||||||||
| SE | JI Londero | 3 | 4 | 5 | J Sousa | 4 | 5 | ||||||||||||||||||||
| 5 | J Sousa | 6 | 6 | 1 | D Thiem | 6 | 4 | 65 | |||||||||||||||||||
| 4 | D Schwartzman | 2 | 6 | 77 | |||||||||||||||||||||||
| 4 | D Schwartzman | 6 | 2 | 6 | |||||||||||||||||||||||
| G Andreozzi | 6 | 65 | 2 |  A Bedene | 4 | 6 | 2 | ||||||||||||||||||||
| A Bedene | 1 | 77 | 6 | 4 | D Schwartzman | 6 | 7 | ||||||||||||||||||||
 A Ramos Viñolas | 6 | 6 | A Ramos Viñolas | 1 | 5 | ||||||||||||||||||||||
| Q |  R Dutra Silva | 3 | 4 | A Ramos Viñolas | 3 | 711 | 6 | ||||||||||||||||||||
| WC | D Ferrer | 715 | 6 | WC | D Ferrer | 6 | 69 | 3 | |||||||||||||||||||
| 8 | M Jaziri | 613 | 3 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | N Jarry | 77 | 4 | 3 | |||||||||||||||||||||||
| Q | L Sonego | 63 | 6 | 6 | Q | L Sonego | 5 | 1 | |||||||||||||||||||
| R Carballés Baena | 6 | 6 | R Carballés Baena | 7 | 6 | ||||||||||||||||||||||
 T Daniel | 1 | 0 | R Carballés Baena | 63 | 4 | ||||||||||||||||||||||
| C Garín | 3 | 7 | 6 | 3 | M Cecchinato | 77 | 6 | ||||||||||||||||||||
| WC |  F Auger-Aliassime | 6 | 5 | 3 | C Garín | 64 | 4 | ||||||||||||||||||||
| 3 | M Cecchinato | 77 | 6 | ||||||||||||||||||||||||
| 3 | M Cecchinato | 6 | 6 | ||||||||||||||||||||||||
| 7 | D Lajović | 3 | 63 | G Pella | 4 | 2 | |||||||||||||||||||||
| L Mayer | 6 | 77 | L Mayer | 4 | 6 | 65 | |||||||||||||||||||||
| WC | F Cerúndolo | 6 | 4 | 1 | G Pella | 6 | 1 | 77 | |||||||||||||||||||
| G Pella | 3 | 6 | 6 | G Pella | 63 | 711 | 6 | ||||||||||||||||||||
| J Munar | 6 | 2 | 6 | J Munar | 77 | 69 | 1 | ||||||||||||||||||||
| F Delbonis | 2 | 6 | 1 | J Munar | 4 | 6 | 7 | ||||||||||||||||||||
| 2 | F Fognini | 6 | 4 | 5 | |||||||||||||||||||||||
Cameron Norrie (qualifying competition) Thiago Monteiro (first round) Lorenzo Sonego (qualified)
Elias Ymer (qualifying competition)
Hugo Dellien (qualifying competition) Marco Trungelliti (first round)
Casper Ruud (first round) Carlos Berlocq (first round)| First round | Qualifying competition | ||||||||||||
| 1 | Cameron Norrie | 6 | 4 | 7 | |||||||||
 Andrej Martin | 4 | 6 | 5 | ||||||||||
| 1 | Cameron Norrie | 78 | 63 | 2 | |||||||||
| Rogério Dutra Silva | 66 | 77 | 6 | ||||||||||
| Rogério Dutra Silva | 6 | 3 | 6 | ||||||||||
| 7 | Casper Ruud | 2 | 6 | 4 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Thiago Monteiro | 710 | 4 | 4 | |||||||||
| Facundo Bagnis | 68 | 6 | 6 | ||||||||||
| Facundo Bagnis | 77 | 6 | |||||||||||
| 5 | Hugo Dellien | 65 | 2 | ||||||||||
| WC | Juan Bautista Otegui | 2 | 2 | ||||||||||
| 5 | Hugo Dellien | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Lorenzo Sonego | 6 | 7 | ||||||||||
| Federico Gaio | 4 | 5 | |||||||||||
| 3 | Lorenzo Sonego | 6 | 3 | ||||||||||
| Alessandro Giannessi | 4 | 3r | |||||||||||
| Alessandro Giannessi | 6 | 6 | |||||||||||
| 6 | Marco Trungelliti | 4 | 1 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Elias Ymer | 3 | 6 | 7 | |||||||||
| WC | Juan Pablo Ficovich | 6 | 4 | 5 | |||||||||
| 4 | Elias Ymer | 4 | 6 | 4 | |||||||||
| Marcelo Arévalo | 6 | 1 | 6 | ||||||||||
| Marcelo Arévalo | 6 | 6 | |||||||||||
| 8 | Carlos Berlocq | 4 | 3 | ||||||||||
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