| Doubles | |
|---|---|
| 2021 Citi Open | |
| Champions |  Raven Klaasen  Ben McLachlan |
| Runners-up |  Neal Skupski  Michael Venus |
| Final score | 7–6(7–4), 6–4 |
Raven Klaasen and Michael Venus were the reigning champions from when the tournament was last held in 2019, [1] but both players chose to participate with different partners.
Klaasen partnered alongside Ben McLachlan and successfully defended his title, defeating Venus and Neal Skupski in the final, 7–6(7–4), 6–4.
John Peers / 
Filip Polášek (first round) Neal Skupski / Michael Venus (final)
Rohan Bopanna / 
Ivan Dodig (first round) Raven Klaasen / Ben McLachlan (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | J Peers F Polášek | 64 | 7 | [7] | |||||||||||||||||||||||
| A de Minaur J Millman | 77 | 5 | [10] | A de Minaur J Millman | 6 | 1 | [8] | ||||||||||||||||||||
 M Arévalo  M Middelkoop | 68 | 2 | M Daniell  M Melo | 3 | 6 | [10] | |||||||||||||||||||||
| M Daniell M Melo | 710 | 6 | M Daniell M Melo | 4 | 5 | ||||||||||||||||||||||
| 4 | R Klaasen B McLachlan | 7 | 6 | 4 | R Klaasen B McLachlan | 6 | 7 | ||||||||||||||||||||
 A Bublik A Golubev | 5 | 2 | 4 | R Klaasen B McLachlan | w/o | ||||||||||||||||||||||
| WC |  S Querrey J Sock | 68 | 2 |  G Dimitrov T Paul | |||||||||||||||||||||||
| G Dimitrov T Paul | 710 | 6 | 4 | R Klaasen B McLachlan | 77 | 6 | |||||||||||||||||||||
S Korda  J Sinner | 1 | 6 | [13] | 2 | N Skupski M Venus | 64 | 4 | ||||||||||||||||||||
| Q |  B Paire J Withrow | 6 | 4 | [11] | S Korda J Sinner | 6 | 6 | ||||||||||||||||||||
| WC | N Kyrgios F Tiafoe | 7 | 1 | [11] | WC | N Kyrgios F Tiafoe | 4 | 4 | |||||||||||||||||||
| 3 | R Bopanna I Dodig | 5 | 6 | [9] | S Korda J Sinner | 3 | 0 | ||||||||||||||||||||
| C Norrie L Saville | 6 | 6 | 2 | N Skupski M Venus | 6 | 6 | |||||||||||||||||||||
 S Gillé J Vliegen | 4 | 4 | C Norrie L Saville | 2 | 3 | ||||||||||||||||||||||
| F Martin M Purcell | 5 | 3 | 2 | N Skupski M Venus | 6 | 6 | |||||||||||||||||||||
| 2 | N Skupski M Venus | 7 | 6 | ||||||||||||||||||||||||
Luke Bambridge / Ken Skupski (first round) Benoît Paire / Jackson Withrow (qualified)| First round | Qualifying competition | ||||||||||||
| 1 | Luke Bambridge Ken Skupski | 3 | 63 | ||||||||||
| WC | Nathaniel Lammons Nicholas Monroe | 6 | 77 | ||||||||||
| WC | Nathaniel Lammons Nicholas Monroe | 2 | 4 | ||||||||||
| 2 | Benoît Paire Jackson Withrow | 6 | 6 | ||||||||||
 Jonathan Erlich Lloyd Harris | 7 | 4 | [6] | ||||||||||
| 2 | Benoît Paire Jackson Withrow | 5 | 6 | [10] | |||||||||
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