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.
| Men's doubles | |
|---|---|
| 2021 Serbia Open | |
| Champions |  Ivan Sabanov Matej Sabanov |
| Runners-up |  Ariel Behar  Gonzalo Escobar |
| Score | 6–3, 7–6(7–5) |
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 | Quarterfinals | Semifinals | 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 | 65 |  T Brkić  N Ćaćić | 3 | 4 | |||||||||||||||||||||
| T Brkić N Ćaćić | 6 | 77 | T Brkić N Ćaćić | 0 | 79 | [10] | |||||||||||||||||||||
| WC | M Kecmanović D Lajović | 4 | 4 | S Bolelli  M González | 6 | 67 | [8] | ||||||||||||||||||||
| S Bolelli M González | 6 | 6 | A Behar G Escobar | 3 | 65 | ||||||||||||||||||||||
 R Bopanna P Cuevas | 1 | 0r | WC | I Sabanov M Sabanov | 6 | 77 | |||||||||||||||||||||
 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 | 711 | 6 | ||||||||||||||||||||
| M Berrettini A Vavassori | 79 | 6 | M Berrettini A Vavassori | 69 | 3 | ||||||||||||||||||||||
A Molteni  F Nielsen | 67 | 4 | M Berrettini A Vavassori | 6 | 77 | ||||||||||||||||||||||
 L Bambridge D Inglot | 65 | 79 | [10] | L Bambridge D Inglot | 4 | 63 | |||||||||||||||||||||
| 2 |  A Krajicek  O Marach | 77 | 67 | [7] | |||||||||||||||||||||||
References
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