2021 Open de Rennes – Doubles
# 2021 Open de Rennes – Doubles

Antonio Šančić and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.

Bart Stevens and Tim van Rijthoven won the title after defeating Marek Gengel and Tomáš Macháč $6–7^{(2–7)},$ 7–5, [10–3] in the final.

## Seeds

* David Pel / Aisam-ul-Haq Qureshi (quarterfinals)
* Hugo Nys / Arthur Rinderknech (first round)
* Manuel Guinard / Albano Olivetti (first round)
* Jeevan Nedunchezhiyan / Purav Raja (semifinals)

## 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 | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| | | | | | 1 | D Pel A-u-H Qureshi | $6^2$ | $6^3$ | | | | | | | | | | |
| | M Gengel T Macháč | $6^5$ | 6 | [10] | | M Gengel T Macháč | $7^7$ | $7^7$ | | | | | | | | | | |
| | T Kamke Y Maden | $7^7$ | 2 | [8] | | | | | | | M Gengel T Macháč | $7^7$ | 6 | | | | | |
| 3 | M Guinard A Olivetti | 7 | 3 | [7] | | | | | | | T Lamasine G Simon | $6^5$ | 1 | | | | | |
| | T Lamasine G Simon | 5 | 6 | [10] | | T Lamasine G Simon | 6 | 6 | | | | | | | | | | |
| | T Matsui K Uesugi | 1 | $6^4$ | | | A Kadhe B Schnur | 0 | 4 | | | | | | | | | | |
| | A Kadhe B Schnur | 6 | $7^7$ | | | | | | | | | | | | M Gengel T Macháč | $7^7$ | 5 | [3] |
| | L Broady S Stakhovsky | | | | | | | | | | | | | | B Stevens T van Rijthoven | $6^2$ | 7 | [10] |
| | T Gabashvili M Janvier | w/o | | | | T Gabashvili M Janvier | 6 | 1 | [5] | | | | | | | | | |
| | K Jacquet H Mayot | 4 | 5 | | 4 | J Nedunchezhiyan P Raja | 3 | 6 | [10] | | | | | | | | | |
| 4 | J Nedunchezhiyan P Raja | 6 | 7 | | | | | | | 4 | J Nedunchezhiyan P Raja | 6 | $6^7$ | [8] | | | | |
| | Mats Hermans G Smits | 6 | 6 | | | | | | | | B Stevens T van Rijthoven | 4 | $7^9$ | [10] | | | | |
| | A Chandrasekar Davide Pozzi | 1 | 3 | | | M Hermans G Smits | 3 | 2 | | | | | | | | | | |
| | B Stevens T van Rijthoven | 1 | 7 | [10] | | B Stevens T van Rijthoven | 6 | 6 | | | | | | | | | | |
| 2 | H Nys A Rinderknech | 6 | 5 | [8] | | | | | | | | | | | | | | |
