| Doubles | |
|---|---|
| 2018 MercedesCup | |
| Champions |  Philipp Petzschner Tim Pütz |
| Runners-up |  Robert Lindstedt  Marcin Matkowski |
| Score | 7–6(7–5), 6–3 |
| Draw | 16 |
| Seeds | 4 |
Jamie Murray and Bruno Soares were defending champions, but chose not to defend their title.
Philipp Petzschner and Tim Pütz won the title, defeating Robert Lindstedt and Marcin Matkowski in the final, 7–6(7–5), 6–3. [1]
Aisam-ul-Haq Qureshi / 
Jean-Julien Rojer (semifinals)
Ben McLachlan Jan-Lennard Struff (first round)
Max Mirnyi / 
Philipp Oswald (quarterfinals)
Marcelo Demoliner / 
Feliciano López (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | A-u-H Qureshi J-J Rojer | 77 | 6 | ||||||||||||||||||||||||
 J Millman  G Pella | 63 | 4 | 1 | A-u-H Qureshi J-J Rojer | 65 | 7 | [10] | ||||||||||||||||||||
| WC | M Bachinger Y Maden | 5 | 67 | N Kyrgios  J Withrow | 77 | 5 | [8] | ||||||||||||||||||||
| N Kyrgios J Withrow | 7 | 79 | 1 | A-u-H Qureshi J-J Rojer | 62 | 3 | |||||||||||||||||||||
| 4 | M Demoliner F López | 6 | 6 | WC | P Petzschner T Pütz | 77 | 6 | ||||||||||||||||||||
P Kohlschreiber  D Nestor | 3 | 4 | 4 | M Demoliner F López | 4 | 77 | [6] | ||||||||||||||||||||
 S Balaji V Vardhan | 2 | 6 | [7] | WC | P Petzschner T Pütz | 6 | 65 | [10] | |||||||||||||||||||
| WC | P Petzschner T Pütz | 6 | 3 | [10] | WC | P Petzschner T Pütz | 77 | 6 | |||||||||||||||||||
| A Begemann M Marterer | 5 | 5 | R Lindstedt M Matkowski | 65 | 3 | ||||||||||||||||||||||
| R Lindstedt M Matkowski | 7 | 7 | R Lindstedt M Matkowski | 6 | 6 | ||||||||||||||||||||||
 H Nys D Shapovalov | 5 | 3 | 3 | M Mirnyi P Oswald | 3 | 4 | |||||||||||||||||||||
| 3 | M Mirnyi P Oswald | 7 | 6 | R Lindstedt M Matkowski | 6 | 67 | [12] | ||||||||||||||||||||
 Sa Ratiwatana So Ratiwatana | 5 | 6 | [7] |  M Fucsovics M Zverev | 3 | 79 | [10] | ||||||||||||||||||||
| M Fucsovics M Zverev | 7 | 3 | [10] | M Fucsovics M Zverev | 6 | 5 | [10] | ||||||||||||||||||||
| J Eysseric L Pouille | 65 | 6 | [10] | J Eysseric L Pouille | 3 | 7 | [4] | ||||||||||||||||||||
| 2 | B McLachlan J-L Struff | 77 | 3 | [7] | |||||||||||||||||||||||
Dmitry Tursunov was the defending champion, but chose not to participate that year.
Gaël Monfils won in the final 7–6(7–1), 3–6, 6–2 against Philipp Kohlschreiber.
Tomáš Berdych was the defender of title; however, he lost to Philipp Petzschner in the quarterfinals. Mikhail Youzhny won in the final 6–3, 4–6, 6–4 against Marin Čilić.
František Čermák and Michal Mertiňák were the defending champions. Čermák chose not to compete, while Mertiňák chose to play with Johan Brunström.
Brunström and Mertiňák lost in the quarterfinals, against Carlos Berlocq and Eduardo Schwank.
This Argentinian pair won the tournament, after defeating Christopher Kas and Philipp Petzschner in the final 7–6(7–5), 7–6(7–6).
František Čermák and Michal Mertiňák unsuccessfully defended their title, after lost to Leoš Friedl and Filip Polášek in the final 3–6, 6–7(7–9).
Jürgen Melzer was the defending champion. He successfully defended his last year's title by beating Lucky loser and his compatriot, Andreas Haider-Maurer 6–7(10–12), 7–6(7–4), 6–4 in the final match.
Bob and Mike Bryan were the defending champions, but lost to Mahesh Bhupathi and Leander Paes in the semifinals.
Gilles Simon was the defending champion, but chose not to compete this year.
Juan Martín del Potro was the defending champion, but chose to compete in Dubai instead.
Kevin Anderson won the title after defeating Marinko Matosevic 6–4, 7–6(7–2) in the final.
Scott Lipsky and Rajeev Ram were the defending champions but decided not to participate.
Colin Fleming and Ross Hutchins defeated Michal Mertiňák and André Sá 2–6, 7–6(7–5), [15–13] in the final to win the title.
Nikolay Davydenko was the defending champion, but lost in the first round to Robert Farah.
Philipp Kohlschreiber won the title defeating Marin Čilić 7–6(10–8), 6–3 in the final.
Philipp Kohlschreiber was the defending champion but lost to Tommy Haas in the semifinals.
Eventually, Haas won the title after defeating Roger Federer in the final by 7–6(7–5), 6–4.
João Sousa was the defending champion, but lost to Benjamin Becker in the first round.
Kei Nishikori won the title, defeating Julien Benneteau in the final, 7–6(7–4), 6–4.
Facundo Bagnis and Thomaz Bellucci were the defending champions, but Bellucci chose not to participate. Bagnis played alongside Marco Cecchinato, but lost in the first round to Michael Berrer and Alexander Zverev.
Mateusz Kowalczyk and Artem Sitak won the title, defeating Guillermo García-López and Philipp Oswald in the final, 2–6, 6–1, [10–7].
Martin Kližan was the defending champion, but withdrew before the tournament began.
Andy Murray won his first clay-court title, defeating Philipp Kohlschreiber in the final, 7–6(7–4), 5–7, 7–6(7–4).
Martin Kližan and Philipp Oswald were the defending champions, but they chose not to participate this year.
Mate Pavić and Michael Venus won the title, defeating Jean-Julien Rojer and Horia Tecău in the final, 7–6(7–4), 2–6, [10–8].
Roberto Bautista Agut was the defending champion, but chose to defend his title in s'Hertogenbosch instead.
Rafael Nadal won the title, defeating Viktor Troicki in the final, 7–6(7–3), 6–3.
Jürgen Melzer and Philipp Petzschner were the defending champions, but chose not to participate this year.
Łukasz Kubot and Marcelo Melo won the title, defeating Jamie Murray and John Peers in the final, 4–6, 7–6(7–3), [10–6].
Jean-Julien Rojer and Horia Tecău were the defending champions, but lost in the semifinals to Philipp Petzschner and Alexander Peya.
Nicolas Mahut and Vasek Pospisil won the title, defeating Petzschner and Peya in the final, 7–6(7–2), 6–4.
Marcel Granollers and David Marrero were the defending champions, but Granollers chose not to participate this year. Marrero played alongside Nenad Zimonjić, but lost in the quarterfinals to Elias and Mikael Ymer.
Jamie Murray and Bruno Soares were the defending champions and successfully defended their title, defeating Bob and Mike Bryan in the final, 7–6(7–4), 7–5.