2018 Mutua Madrid Open – Men's doubles
| Men's doubles | |
|---|---|
| 2018 Mutua Madrid Open | |
| Champions | Nikola Mektić Alexander Peya |
| Runners-up | Bob Bryan Mike Bryan |
| Score | 5–3, ret. |
Nikola Mektić and Alexander Peya defeated Bob and Mike Bryan in the final, 5–3, after Bob Bryan retired due to a hip injury. The Bryan brothers would have regained the ATP no. 1 doubles ranking from Kubot and Melo if they had won the title. This was their first retirement as a team in 1,407 matches.
Łukasz Kubot and Marcelo Melo were the defending champions, but lost to Juan Sebastián Cabal and Robert Farah in the quarterfinals.