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Guido Andreozzi and Andrés Molteni were the defending champions[1] but only Andreozzi chose to defend his title, partnering Thiago Seyboth Wild. Andreozzi withdrew from the tournament before his quarterfinal match.
| Doubles | |
|---|---|
| 2021 Challenger de Buenos Aires | |
| Champions |  Luciano Darderi Juan Bautista Torres |
| Runners-up | Hernán Casanova Santiago Rodríguez Taverna |
| Score | 7–6(7–5), 7–6(12–10) |
Luciano Darderi and Juan Bautista Torres won the title after defeating Hernán Casanova and Santiago Rodríguez Taverna 7–6(7–5), 7–6(12–10) in the final.
Rafael Matos / Felipe Meligeni Alves (quarterfinals)- Fernando Romboli /
Federico Zeballos (first round) 
Guillermo Durán / Thiago Agustín Tirante (quarterfinals)
Max Schnur / Reese Stalder (first round)
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- SE = Special exempt
- PR = Protected ranking
- ITF = ITF entry
- JE = Junior exempt
- w/o = Walkover
- r = Retired
- d = Defaulted
- SR = Special ranking
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 |  R Matos F Meligeni Alves
| 6 | 7 | ||||||||||||||||||||||||
F Cerúndolo  M Cuevas
| 2 | 5 | 1 | R Matos F Meligeni Alves
| 63 | 6 | [6] | ||||||||||||||||||||
| L Darderi JB Torres
| 79 | 6 | L Darderi JB Torres
| 77 | 2 | [10] | |||||||||||||||||||||
| TM Etcheverry R Olivo
| 67 | 2 | L Darderi JB Torres
| 77 | 6 | ||||||||||||||||||||||
| 4 |  M Schnur R Stalder
| 6 | 2 | [6] | WC | L Aboian V Aboian
| 63 | 4 | |||||||||||||||||||
| WC | Leonardo Aboian V Aboian
| 3 | 6 | [10] | WC | L Aboian V Aboian
| w/o | ||||||||||||||||||||
| WC | Juan Manuel La Serna Lautaro Midón
| 4 | 1 | G Andreozzi T Seyboth Wild
| |||||||||||||||||||||||
| G Andreozzi T Seyboth Wild
| 6 | 6 | L Darderi JB Torres
| 77 | 712 | ||||||||||||||||||||||
| H Casanova S Rodríguez Taverna
| 6 | 77 | H Casanova S Rodríguez Taverna
| 65 | 610 | ||||||||||||||||||||||
| A Collarini Mariano Kestelboim
| 2 | 63 | H Casanova S Rodríguez Taverna
| 6 | 64 | [10] | |||||||||||||||||||||
P Cachin C Gómez-Herrera
| 3 | G Durán TA Tirante
| 1 | 77 | [8] | ||||||||||||||||||||||
| 3 | G Durán TA Tirante
| w/o | H Casanova S Rodríguez Taverna
| 6 | 6 | ||||||||||||||||||||||
 N Hardt N Sánchez Izquierdo
| w/o | N Kicker C Ugo Carabelli
| 3 | 2 | |||||||||||||||||||||||
| WC | F Comesaña M Navone
| N Hardt N Sánchez Izquierdo
| 6 | 4 | [6] | ||||||||||||||||||||||
| N Kicker C Ugo Carabelli
| 7 | 6 | N Kicker C Ugo Carabelli
| 2 | 6 | [10] | |||||||||||||||||||||
| 2 | F Romboli F Zeballos
| 5 | 0 | ||||||||||||||||||||||||
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