| Doubles | |
|---|---|
| 2018 Open de Rennes | |
| Champions |  Sander Gillé Joran Vliegen |
| Runners-up |  Sander Arends  Antonio Šančić |
| Final score | 6–3, 6–7(1–7), [10–7] |
Evgeny Donskoy and Mikhail Elgin were the defending champions but chose not to defend their title.
Sander Gillé and Joran Vliegen won the title after defeating Sander Arends and Antonio Šančić 6–3, 6–7(1–7), [10–7] in the final.
Jonathan Eysseric / Hugo Nys (semifinals) Sander Arends / Antonio Šančić (final)
Romain Arneodo / 
Tristan-Samuel Weissborn (quarterfinals) Sander Gillé / Joran Vliegen (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | J Eysseric H Nys | 77 | 6 | ||||||||||||||||||||||||
 R Berankis  G Elias | 64 | 0 | 1 | J Eysseric H Nys | 6 | 6 | |||||||||||||||||||||
 T Matsui  A Motti | 1 | 77 | [6] | K de Schepper G Sakharov | 4 | 0 | |||||||||||||||||||||
| K de Schepper G Sakharov | 6 | 65 | [10] | 1 | J Eysseric H Nys | 4 | 78 | [7] | |||||||||||||||||||
| 4 | S Gillé J Vliegen | 6 | 6 | 4 | S Gillé J Vliegen | 6 | 66 | [10] | |||||||||||||||||||
| WC | C Hemery L Lokoli | 4 | 3 | 4 | S Gillé J Vliegen | 6 | 6 | ||||||||||||||||||||
 S Clayton J O'Mara | 4 | 78 | [8] |  D Brown D Pel | 3 | 2 | |||||||||||||||||||||
| D Brown D Pel | 6 | 66 | [10] | 4 | S Gillé J Vliegen | 6 | 61 | [10] | |||||||||||||||||||
| WC | M Guinard M Janvier | 2 | 6 | [6] | 2 | S Arends A Šančić | 3 | 77 | [7] | ||||||||||||||||||
 S Balaji V Vardhan | 6 | 4 | [10] | S Balaji V Vardhan | 3 | 77 | [10] | ||||||||||||||||||||
 U Ignatik Y Uchiyama | 3 | 4 | 3 | R Arneodo T-S Weissborn | 6 | 64 | [7] | ||||||||||||||||||||
| 3 | R Arneodo T-S Weissborn | 6 | 6 | S Balaji V Vardhan | 4 | 4 | |||||||||||||||||||||
 S Stakhovsky  M Youzhny | 6 | 6 | 2 | S Arends A Šančić | 6 | 6 | |||||||||||||||||||||
| M Draganja T Draganja | 4 | 4 | S Stakhovsky M Youzhny | ||||||||||||||||||||||||
| WC | E Furness T Lamasine | 2 | 4 | 2 | S Arends A Šančić | w/o | |||||||||||||||||||||
| 2 | S Arends A Šančić | 6 | 6 | ||||||||||||||||||||||||
Sander Arends and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.
Grégoire Barrère and Tristan Lamasine were the defending champions but only Lamasine chose to defend his title, partnering Hugo Nys. Lamasine lost in the quarterfinals to Gero Kretschmer and Alexander Satschko.
Alexander Satschko and Simon Stadler were the defending champions but only Satschko chose to defend his title, partnering Gero Kretschmer. Satschko lost in the quarterfinals to Sander Gillé and Joran Vliegen.
This was a doubles tennis event in a professional tennis tournament held in Biella, Italy, in the summer of 2017.
Mikhail Elgin and Andrei Vasilevski were the defending champions but chose not to defend their title.
Nikola Mektić and Antonio Šančić were the defending champions but chose not to defend their title.
Robin Haase and Tim Pütz were the defending champions but chose not to defend their title.
Hans Podlipnik-Castillo and Andrei Vasilevski were the defending champions but chose not to defend their title.
The 2018 Open de Rennes was a professional tennis tournament played on hard courts. It was the twelfth edition of the tournament and part of the 2018 ATP Challenger Tour. It took place in Rennes, France between 22 and 28 January 2018.
Mikhail Elgin and Igor Zelenay were the defending champions but chose not to defend their title.
Roman Jebavý and Igor Zelenay were the defending champions but chose not to defend their title.
Sander Arends and Antonio Šančić were the defending champions but chose not to defend their title.
Sander Arends and Antonio Šančić were the defending champions but only Šančić chose to defend his title, partnering Purav Raja. Šančić lost in the finals to Sander Gillé and Joran Vliegen.
Sander Arends and Antonio Šančić were the defending champions but only Arends chose to defend his title, partnering Romain Arneodo. Arends lost in the quarterfinals to Simone Bolelli and Daniele Bracciali.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
Roman Jebavý and Andrés Molteni were the defending champions, but chose not to participate together. Jebavý played alongside Matwé Middelkoop but lost in the semifinals to Philipp Oswald and Filip Polášek. Molteni partnered Leonardo Mayer but lost in the first round to Oliver Marach and Jürgen Melzer.
Sander Gillé and Joran Vliegen were the defending champions but lost in the first round to Sander Arends and David Pel.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
Sander Gillé and Joran Vliegen were the reigning champions from when the tournament was last held in 2019, but chose not to defend their title.