# 2021 Monte-Carlo Masters – Doubles

Defending champion Nikola Mektić and his partner, Mate Pavić, defeated Dan Evans and Neal Skupski in the final, 6–3, 4–6, [10–7], to win the doubles tennis title at the 2021 Monte-Carlo Masters. It was the all-Croatian duo's second consecutive ATP Tour Masters 1000 title together and their fifth title overall of the year. The win also earned Mektić his first successful career title defense. The match was the second successive encounter between both teams in consecutive Masters 1000 finals.
Mektić won the tournament when it was last held in 2019 with Franko Škugor, but Škugor did not return to compete.
Pavić and Robert Farah were in contention for the ATP No. 1 doubles ranking at the start of the tournament. After Farah lost in the semifinals, Pavić retained the top ranking by reaching the final.

## Seeds

* Juan Sebastián Cabal / Robert Farah (semifinals)
* Nikola Mektić / Mate Pavić (champions)
* Ivan Dodig / Filip Polášek (second round)
* Marcel Granollers / Horacio Zeballos (semifinals)
* Rajeev Ram / Joe Salisbury (second round)
* Wesley Koolhof / Łukasz Kubot (second round)
* Pierre-Hugues Herbert / Nicolas Mahut (quarterfinals)
* Kevin Krawietz / Horia Tecău (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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Juan Sebastián CabalRobert Farah | 6$^0$ | 6 | [4] | | | | | |
| | Dan Evans Neal Skupski | 7$^7$ | 2 | [10] | | | | | |
| | Dan Evans Neal Skupski | 7$^7$ | 2 | [10] | | Dan EvansNeal Skupski | 3 | 6 | [7] |
| | | | | | 2 | Nikola MektićMate Pavić | 6 | 4 | [10] |
| 4 | Marcel GranollersHoracio Zeballos | 6 | 5 | [4] | 2 | Nikola MektićMate Pavić | 6 | 4 | [10] |
| 2 | Nikola Mektić Mate Pavić | 3 | 7 | [10] | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | JS Cabal R Farah | 6 | 6 | | | | | | | | | | | |
| | F Auger-Aliassime H Hurkacz | 5 | | | | F Auger-AliassimeH Hurkacz | 0 | 2 | | | | | | | | | | | |
| WC | R ArneodoH Nys | 2$^r$ | | | | | | | | 1 | JS Cabal R Farah | 7$^7$ | 7 | | | | | | |
| | F Fognini D Schwartzman | 6 | 7 | | | | | | | | F FogniniD Schwartzman | 6$^5$ | 5 | | | | | | |
| | O MarachL Saville | 4 | 5 | | | F Fognini D Schwartzman | 1 | 6 | [10] | | | | | | | | | | |
| | A MannarinoB Paire | 6$^2$ | 3 | | 6 | W KoolhofŁ Kubot | 6 | 4 | [7] | | | | | | | | | | |
| 6 | W Koolhof Ł Kubot | 7$^7$ | 6 | | | | | | | | | | | | 1 | JS CabalR Farah | 6$^0$ | 6 | [4] |
| | | | | | | | | | | | | | | | | D Evans N Skupski | 7$^7$ | 2 | [10] |
| | | | | | 3 | I DodigF Polášek | 6 | 6$^5$ | [11] | | | | | | | | | | |
| | S GilléJ Vliegen | 6$^5$ | 6 | [8] | | D Evans N Skupski | 3 | 7$^7$ | [13] | | | | | | | | | | |
| | D Evans N Skupski | 7$^7$ | 3 | [10] | | | | | | | D Evans N Skupski | 1 | 7$^7$ | [10] | | | | | |
| | A de MinaurJ Peers | 6$^3$ | 6 | [9] | | | | | | | R KlaasenB McLachlan | 6 | 6$^5$ | [4] | | | | | |
| | R Klaasen B McLachlan | 7$^7$ | 3 | [11] | | R Klaasen B McLachlan | 6$^1$ | 6 | [10] | | | | | | | | | | |
| | M MeloJ-J Rojer | 6 | 1 | [8] | 5 | R RamJ Salisbury | 7$^7$ | 3 | [5] | | | | | | | | | | |
| 5 | R Ram J Salisbury | 4 | 6 | [10] | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | K KrawietzH Tecău | 6$^4$ | 6 | [9] | | | | | | | | | | | | | | |
| WC | P Tsitsipas S Tsitsipas | 7$^7$ | 3 | [11] | WC | P TsitsipasS Tsitsipas | 4 | 4 | | | | | | | | | | |
| | C Garín G Pella | 4 | 7$^7$ | [10] | | C Garín G Pella | 6 | 6 | | | | | | | | | | |
| | J MurrayJ-L Struff | 6 | 6$^4$ | [5] | | | | | | | C GarínG Pella | 3 | 1 | | | | | |
| | J ChardyF Martin | 7$^9$ | 4 | [4] | | | | | | 4 | M Granollers H Zeballos | 6 | 6 | | | | | |
| | K Khachanov A Rublev | 6$^7$ | 6 | [10] | | K KhachanovA Rublev | 3 | 1 | | | | | | | | | | |
| | | | | | 4 | M Granollers H Zeballos | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 4 | M GranollersH Zeballos | 6 | 5 | [4] |
| 7 | P-H Herbert N Mahut | 6 | 6 | | | | | | | | | | | 2 | N Mektić M Pavić | 3 | 7 | [10] |
| WC | S BolelliJ Sinner | 4 | 4 | | 7 | P-H Herbert N Mahut | 7$^7$ | 7 | | | | | | | | | | |
| | H Kontinen É Roger-Vasselin | 6 | 6 | | | H KontinenÉ Roger-Vasselin | 6$^3$ | 5 | | | | | | | | | | |
| Alt | A BublikD Lajović | 4 | 4 | | | | | | | 7 | P-H HerbertN Mahut | 3 | 1 | | | | | |
| Alt | A Behar G Escobar | 6 | 6 | | | | | | | 2 | N Mektić M Pavić | 6 | 6 | | | | | |
| | G DimitrovD Goffin | 4 | 3 | | Alt | A BeharG Escobar | 4 | 6 | [3] | | | | | | | | | |
| | | | | | 2 | N Mektić M Pavić | 6 | 1 | [10] | | | | | | | | | |