2021 Serbia Open – Men's doubles
# 2021 Serbia Open – Men's doubles

Jonathan Erlich and Andy Ram were the last defending champions after victory in 2012, but Erlich chose not to participate and Ram retired from professional tennis in 2014.

Ivan and Matej Sabanov won the title, defeating Ariel Behar and Gonzalo Escobar in the final, 6–3, $7–6^{(7–5)}.$

## Seeds

* Nikola Mektić / Mate Pavić (withdrew)
* Austin Krajicek / Oliver Marach (first round)
* Raven Klaasen / Ben McLachlan (first round)
* Marcelo Arévalo / Matwé Middelkoop (first round)

## 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

### Draw

| First round | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Alt | A Sitak S Travaglia | 2 | 6 | [6] | | | | | | | | | | | | | |
| | A Behar G Escobar | 6 | 3 | [10] | | A Behar G Escobar | 6 | 7 | | | | | | | | | |
| | J Millman J-P Smith | 6 | 6 | | | J Millman J-P Smith | 4 | 5 | | | | | | | | | |
| | M Demoliner S González | 4 | 3 | | | | | | | | A Behar G Escobar | 6 | 6 | | | | |
| 4 | M Arévalo M Middelkoop | 4 | $6^5$ | | | | | | | | T Brkić N Ćaćić | 3 | 4 | | | | |
| | T Brkić N Ćaćić | 6 | $7^7$ | | | T Brkić N Ćaćić | 0 | $7^9$ | [10] | | | | | | | | |
| WC | M Kecmanović D Lajović | 4 | 4 | | | S Bolelli M González | 6 | $6^7$ | [8] | | | | | | | | |
| | S Bolelli M González | 6 | 6 | | | | | | | | | | | | A Behar G Escobar | 3 | $6^5$ |
| | R Bopanna P Cuevas | 1 | $0^r$ | | | | | | | | | | | WC | I Sabanov M Sabanov | 6 | $7^7$ |
| | A Bedene D Sharan | 6 | 0 | | | A Bedene D Sharan | 1 | 3 | | | | | | | | | |
| WC | I Sabanov M Sabanov | 6 | 6 | | WC | I Sabanov M Sabanov | 6 | 6 | | | | | | | | | |
| 3 | R Klaasen B McLachlan | 4 | 2 | | | | | | | WC | I Sabanov M Sabanov | $7^{11}$ | 6 | | | | |
| | M Berrettini A Vavassori | $7^9$ | 6 | | | | | | | | M Berrettini A Vavassori | $6^9$ | 3 | | | | |
| | A Molteni F Nielsen | $6^7$ | 4 | | | M Berrettini A Vavassori | 6 | $7^7$ | | | | | | | | | |
| | L Bambridge D Inglot | $6^5$ | $7^9$ | [10] | | L Bambridge D Inglot | 4 | $6^3$ | | | | | | | | | |
| 2 | A Krajicek O Marach | $7^7$ | $6^7$ | [7] | | | | | | | | | | | | | |
