Rogério Dutra Silva and André Sá were the defending champions, but chose not to participate together. Sá teamed up with Thomaz Bellucci, but lost to Federico Delbonis and Máximo González in the quarterfinals. Dutra Silva played alongside Roman Jebavý, but lost to Delbonis and González in the semifinals.
| Doubles | |
|---|---|
| 2018 Brasil Open | |
| Champions |  Federico Delbonis Máximo González |
| Runners-up |  Wesley Koolhof Artem Sitak |
| Score | 6–4, 6–2 |
Delbonis and González went on to win the title, defeating Wesley Koolhof and Artem Sitak in the final, 6–4, 6–2.
Seeds edit
Pablo Cuevas / 
Horacio Zeballos (quarterfinals, withdrew)
Hans Podlipnik-Castillo / 
Andrei Vasilevski (first round)- Guillermo Durán / Andrés Molteni (quarterfinals)
Wesley Koolhof / 
Artem Sitak (final)
Draw edit
Key edit
- 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
Draw edit
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 |  P Cuevas H Zeballos
| 6 | 6 | ||||||||||||||||||||||||
 S Galdós G Pella
| 1 | 2 | 1 | P Cuevas H Zeballos
| |||||||||||||||||||||||
| Alt |  P Bernardi T Monteiro
| 3 | 4 | C Berlocq N Kicker
| w/o | ||||||||||||||||||||||
| C Berlocq N Kicker
| 6 | 6 | C Berlocq N Kicker
| 3 | 3 | ||||||||||||||||||||||
| 4 | W Koolhof A Sitak
| 6 | 77 | 4 | W Koolhof A Sitak
| 6 | 6 | ||||||||||||||||||||
S Arends  A Begemann
| 4 | 64 | 4 | W Koolhof A Sitak
| 7 | 6 | |||||||||||||||||||||
 R Carballés Baena G García López
| 6 | 7 | R Carballés Baena G García López
| 5 | 4 | ||||||||||||||||||||||
| WC |  D Descloix G Monfils
| 2 | 5 | 4 | W Koolhof A Sitak
| 4 | 2 | ||||||||||||||||||||
R Dutra Silva  R Jebavý
| 6 | 77 | F Delbonis M González
| 6 | 6 | ||||||||||||||||||||||
 M Cecchinato A Ramos Viñolas
| 4 | 64 | R Dutra Silva R Jebavý
| 6 | 6 | ||||||||||||||||||||||
| Alt | F Neis R Olivo
| 2 | 0r | 3 | G Durán A Molteni
| 4 | 3 | ||||||||||||||||||||
| 3 | G Durán A Molteni
| 6 | 0 | R Dutra Silva R Jebavý
| 5 | 6 | [7] | ||||||||||||||||||||
 R Arneodo  A Šančić
| 62 | 3 | F Delbonis M González
| 7 | 3 | [10] | |||||||||||||||||||||
| WC | T Bellucci A Sá
| 77 | 6 | WC | T Bellucci A Sá
| 64 | 5 | ||||||||||||||||||||
| F Delbonis M González
| 7 | 4 | [10] | F Delbonis M González
| 77 | 7 | |||||||||||||||||||||
| 2 |  H Podlipnik-Castillo  A Vasilevski
| 5 | 6 | [5] | |||||||||||||||||||||||