2018 Milex Open – Doubles
| Doubles | |
|---|---|
| 2018 Milex Open | |
| Champions |  Leander Paes Miguel Ángel Reyes-Varela |
| Runners-up |  Ariel Behar Roberto Quiroz |
| Score | 4–6, 6–3, [10–5] |
Juan Ignacio Londero and Luis David Martínez were the defending champions but only Londero chose to defend his title, partnering Tomás Lipovsek Puches. Londero lost in the semifinals to Leander Paes and Miguel Ángel Reyes-Varela.
Paes and Reyes-Varela won the title after defeating Ariel Behar and Roberto Quiroz 4–6, 6–3, [10–5] in the final.
Seeds
Pablo Cuevas / 
David Marrero (Quarterfinals)
Leander Paes / 
Miguel Ángel Reyes-Varela (Champions)
Marcelo Arévalo / Jeevan Nedunchezhiyan (Quarterfinals)
Gonzalo Escobar / 
Fernando Romboli (Quarterfinals)
Draw
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 | P Cuevas D Marrero
| 6 | 6 | ||||||||||||||||||||||||
 G Andreozzi G Durán
| 3 | 3 | 1 | P Cuevas D Marrero
| 3 | 7 | [7] | ||||||||||||||||||||
| WC |  R Cid Subervi J Hernández-Fernández
| 0 | 3 | WC |  H Dellien V Estrella Burgos
| 6 | 5 | [10] | |||||||||||||||||||
| WC | H Dellien V Estrella Burgos
| 6 | 6 | WC | H Dellien V Estrella Burgos
| 3 | 6 | [3] | |||||||||||||||||||
| 3 |  M Arévalo J Nedunchezhiyan
| 6 | 77 | A Behar R Quiroz
| 6 | 3 | [10] | ||||||||||||||||||||
| WC | J Olivares C Rodríguez
| 3 | 62 | 3 | M Arévalo J Nedunchezhiyan
| 7 | 4 | [7] | |||||||||||||||||||
 R Dutra Silva P Lorenzi
| 2 | 6 | [5] | A Behar R Quiroz
| 5 | 6 | [10] | ||||||||||||||||||||
| A Behar R Quiroz
| 6 | 4 | [10] | A Behar R Quiroz
| 6 | 3 | [5] | ||||||||||||||||||||
| T Lipovsek Puches JI Londero
| w/o | 2 | L Paes MÁ Reyes-Varela
| 4 | 6 | [10] | |||||||||||||||||||||
| F Bagnis C Berlocq
| T Lipovsek Puches JI Londero
| 65 | 78 | [11] | |||||||||||||||||||||||
 S Galdós T Monteiro
| 64 | 62 | 4 | G Escobar F Romboli
| 77 | 66 | [9] | ||||||||||||||||||||
| 4 | G Escobar F Romboli
| 77 | 77 | T Lipovsek Puches JI Londero
| 4 | 63 | |||||||||||||||||||||
 G Melzer J Melzer
| 6 | 6 | 2 | L Paes MÁ Reyes-Varela
| 6 | 77 | |||||||||||||||||||||
 A Begemann F Polášek
| 3 | 3 | G Melzer J Melzer
| 5 | 67 | ||||||||||||||||||||||
 G Elias P Krstin
| 3 | 0 | 2 | L Paes MÁ Reyes-Varela
| 7 | 79 | |||||||||||||||||||||
| 2 | L Paes MÁ Reyes-Varela
| 6 | 6 | ||||||||||||||||||||||||