| Doubles | |
|---|---|
| 2019 AON Open Challenger | |
| Champions |  Ariel Behar  Gonzalo Escobar |
| Runners-up |  Guido Andreozzi Andrés Molteni |
| Final score | 3–6, 6–4, [10–3] |
Kevin Krawietz and Andreas Mies were the defending champions [1] but chose not to defend their title.
Ariel Behar and Gonzalo Escobar won the title after defeating Guido Andreozzi and Andrés Molteni 3–6, 6–4, [10–3] in the final.
Matwé Middelkoop / 
Igor Zelenay (semifinals)
Romain Arneodo / Hugo Nys (quarterfinals) Guido Andreozzi / Andrés Molteni (final)
Rogério Dutra Silva / 
Roman Jebavý (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Middelkoop I Zelenay | 6 | 6 | ||||||||||||||||||||||||
F Neis  D Vega Hernández | 3 | 1 | 1 | M Middelkoop I Zelenay | 3 | 6 | [10] | ||||||||||||||||||||
| WC |  A Begemann  F Mergea | 6 | 7 | WC | A Begemann F Mergea | 6 | 1 | [6] | |||||||||||||||||||
| WC |  A Giannessi G Mager | 0 | 5 | 1 | M Middelkoop I Zelenay | 3 | 3 | ||||||||||||||||||||
| 4 | R Dutra Silva R Jebavý | 6 | 3 | [4] | A Behar G Escobar | 6 | 6 | ||||||||||||||||||||
 T Brkić  A Pavić | 2 | 6 | [10] | T Brkić A Pavić | 4 | 1 | |||||||||||||||||||||
| A Behar G Escobar | 6 | 6 | A Behar G Escobar | 6 | 6 | ||||||||||||||||||||||
| L Giustino G Granollers | 3 | 2 | A Behar G Escobar | 3 | 6 | [10] | |||||||||||||||||||||
 A Balázs F Romboli | 77 | 77 | 3 | G Andreozzi A Molteni | 6 | 4 | [3] | ||||||||||||||||||||
 R Junaid  P Raja | 62 | 63 | A Balázs F Romboli | 3 | 2 | ||||||||||||||||||||||
| F Baldi S Caruso | 1 | 1 | 3 | G Andreozzi A Molteni | 6 | 6 | |||||||||||||||||||||
| 3 | G Andreozzi A Molteni | 6 | 6 | 3 | G Andreozzi A Molteni | 3 | 6 | [10] | |||||||||||||||||||
 K Coppejans T Monteiro | 3 | 4 | F Bagnis S Travaglia | 6 | 1 | [5] | |||||||||||||||||||||
| F Bagnis S Travaglia | 6 | 6 | F Bagnis S Travaglia | 6 | 7 | ||||||||||||||||||||||
| WC | F Gaio A Pellegrino | 4 | 5 | 2 | R Arneodo H Nys | 3 | 5 | ||||||||||||||||||||
| 2 | R Arneodo H Nys | 6 | 7 | ||||||||||||||||||||||||
Guido Andreozzi and Marcel Felder won the title defeating Thiago Alves and Augusto Laranja in the final 6–3, 6–3.
Andrés Molteni and Marco Trungelliti were the defending champions but decided not to participate.
Pavol Červenák and Matteo Viola defeated Guilherme Clezar and Gastão Elias 6–2, 4–6, [10–6] in the final to win the title.
Guillermo Durán and Máximo González were the defending champions, but González chose not to play this year. Guillermo Durán played alongside Andrés Molteni and lost in the first round to Guido Andreozzi and Guido Pella.
Andrés Molteni and Fernando Romboli were the defending champions, but both players chose not to participate.
Máximo González and Andrés Molteni were the defending champions, but decided not to compete together. González competed alongside Roberto Maytin, while Molteni played alongside Guido Pella.
Guido Pella and Diego Schwartzman were the defending champions, but Schwartzman decided not to participate this year. Pella played alongside Andrés Molteni, but they lost to Guido Andreozzi and Sergio Galdós in the semifinals.
Daniele Bracciali and Potito Starace were the defending champions, but could not defend their title due to being banned from tennis for betting offences.
Guillermo Durán and Andrés Molteni were the defending champions but only Molteni chose to defend his title, partnering Guido Andreozzi. Molteni lost in the first round to Franco Agamenone and Federico Zeballos.
Guido Andreozzi and Andrés Molteni were the defending champions but only Andreozzi chose to defend his title, partnering Sergio Galdós. Andreozzi lost in the first round to Alessandro Giannessi and Gianluca Mager.
Andrés Molteni and Diego Schwartzman were the defending champions but only Molteni chose to defend his title, partnering Sergio Galdós. Molteni lost in the first round to Pedro Cachín and Nicolás Jarry.
Marcelo Tomás Barrios Vera and Nicolás Jarry were the defending champions but only Barrios Vera chose to defend his title, partnering José Hernández-Fernández. Barrios Vera lost in the semifinals to Romain Arneodo and Jonathan Eysseric.
Wesley Koolhof and Artem Sitak were the defending champions but chose not to defend their title.
Miguel Ángel Reyes-Varela and Blaž Rola were the defending champions but chose not to defend their title.
Romain Arneodo and Fernando Romboli were the defending champions but only Romboli chose to defend his title, partnering Fabrício Neis. Romboli lost in the first round to Sergio Galdós and Federico Zeballos.
Ariel Behar and Fabiano de Paula were the defending champions but chose not to defend their title.
Karol Drzewiecki and Filip Polášek were the defending champions but only Drzewiecki chose to defend his title, partnering Maciej Smoła. Drzewiecki lost in the first round to Matwé Middelkoop and Hans Podlipnik Castillo.
Guido Andreozzi and Guillermo Durán were the defending champions but only Andreozzi chose to defend his title, partnering Andrés Molteni. Andreozzi successfully defended his title.
Guido Andreozzi and Guillermo Durán were the defending champions but chose not to defend their title.
Guido Andreozzi and Andrés Molteni were the defending champions but only Molteni chose to defend his title, partnering Santiago González. Molteni successfully defended his title.
Guido Andreozzi and Andrés Molteni were the defending champions but only Andreozzi chose to defend his title, partnering Thiago Seyboth Wild. Andreozzi withdrew from the tournament before his quarterfinal match.