Andrej Martin and Hans Podlipnik were the defending champions but chose to participate with different partners. Martin chose to participate with Tomasz Bednarek, while Podlipnik chose to partner with Lukáš Dlouhý. Martin and Podlipnik faced each other in the semifinals, with Podlipnik advancing to the final. Podlipnik failed to defend his title, losing to Sander Arends and Tristan-Samuel Weissborn 7–6(10–8), 6–7(4–7), [10–5] in the final.
Andrej Martin and Hans Podlipnik were the defending champions but chose not to participate.
Wesley Koolhof and Matwé Middelkoop were the defending champions but lost in the quarterfinals to Sander Arends and Adam Majchrowicz.
Wesley Koolhof and Matwé Middelkoop were the defending champions but chose not to defend their title.
Maximilian Neuchrist and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.
Ken and Neal Skupski were the defending champions but chose not to defend their title.
Danilo Petrović and Tak Khunn Wang were the defending champions but chose not to defend their title.
Sander Arends and Tristan-Samuel Weissborn were the defending champions but only Weissborn chose to defend his title, partnering Dino Marcan. Weissborn lost in the quarterfinals to Hugo Nys and Max Schnur.
Denis Matsukevich and Andrei Vasilevski were the defending champions but chose to defend their title with different partners. Matsukevich partnered Riccardo Ghedin but lost in the quarterfinals to Laurynas Grigelis and Zdeněk Kolář. Vasilevski partnered Hans Podlipnik-Castillo but lost in the semifinals to Prajnesh Gunneswaran and Vishnu Vardhan.
Aliaksandr Bury and Igor Zelenay were the defending champions but chose to defend their title with different partners. Bury partnered Ariel Behar but lost in the quarterfinals to Guillermo Durán and Andrés Molteni. Zelenay partnered Julian Knowle but lost in the first round to David Marrero and Leander Paes.
Guido Andreozzi and Andrés Molteni were the defending champions but only Andreozzi chose to defend his title, partnering Sergio Galdós. Andreozzi lost in the first round to Alessandro Giannessi and Gianluca Mager.
Sergey Betov and Ilya Ivashka were the defending champions but only Ivashka chose to defend his title, partnering Aldin Šetkić. Ivashka lost in the semifinals to Lukáš Rosol and Franko Škugor.
Mikhail Elgin and Denis Istomin were the defending champions but lost in the first round to James Cerretani and Marc Polmans.
Hans Podlipnik-Castillo and Andrei Vasilevski were the defending champions but chose not to defend their title.
Marin and Tomislav Draganja were the defending champions but only Tomislav chose to defend his title, partnering Alessandro Giannessi. Tomislav Draganja lost in the quarterfinals to Andrej Martin and Hans Podlipnik Castillo.
Hans Podlipnik Castillo and Andrei Vasilevski were the defending champions but only Vasilevski chose to defend his title, partnering Vladyslav Manafov. Vasilevski lost in the first round to Federico Gaio and Enrique López Pérez.
Toshihide Matsui and Frederik Nielsen were the defending champions but only Matsui chose to defend his title, partnering Ričardas Berankis. Matsui lost in the first round to Nam Ji-sung and Song Min-kyu.
Julian Ocleppo and Andrea Vavassori were the defending champions but chose to defend their title with different partners. Ocleppo partnered Andrea Pellegrino but lost in the first round to David Marrero and Roberto Maytín. Vavassori partnered Andrei Vasilevski but lost in the final to Tomislav Brkić and Ante Pavić.
Daniele Bracciali and Matteo Donati were the defending champions but chose not to defend their title.
Luke Bambridge and Jonny O'Mara were the defending champions but only O'Mara chose to defend his title, partnering Ken Skupski. O'Mara lost in the semifinals to Hans Podlipnik Castillo and Tristan-Samuel Weissborn.
Dino Marcan 
Tristan-Samuel Weissborn 
Steven de Waard 
Blaž Kavčič 
