Doubles
2021 Citi Open
Final
Champions	Raven Klaasen Ben McLachlan
Runners-up	Neal Skupski Michael Venus
Score	7–6(7–4), 6–4
Events
Singles Doubles
← 2019 · Washington Open · 2022 →

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.

	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

	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]

• Main Draw
• Qualifying Draw