2021 Kremlin Cup – Men's doubles

Marcelo Demoliner and Matwé Middelkoop were the reigning champions from when the tournament was last held in 2019, but chose to compete with different partners. Demoliner played alongside Marcus Daniell, but lost in the first round to Ariel Behar and Gonzalo Escobar.

Men's doubles
2021 Kremlin Cup
Champions	Harri Heliövaara Matwé Middelkoop
Runners-up	Tomislav Brkić Nikola Ćaćić
Score	7–5, 4–6, [11–9]
Draw	16
Seeds	4

Main article: 2021 Kremlin Cup

Middelkoop teamed up with Harri Heliövaara to successfully defend the title, defeating Tomislav Brkić and Nikola Ćaćić in the final, 7–5, 4–6, [11–9].

Seeds

1. Raven Klaasen / Ben McLachlan (first round)
2. Andrey Golubev / Hugo Nys (first round)
3. Luke Saville / John-Patrick Smith (first round)
4. Tomislav Brkić / Nikola Ćaćić (final)

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
	1	R Klaasen B McLachlan	2	4
		R Bopanna A-u-H Qureshi	6	6					R Bopanna A-u-H Qureshi	64	7	[8]
	PR	L Đere G Pella	5	77	[6]				I Ivashka P Martínez	77	5	[10]
		I Ivashka P Martínez	7	62	[10]											I Ivashka P Martínez	4	6	[8]
	4	T Brkić N Ćaćić	6	6											4	T Brkić N Ćaćić	6	4	[10]
		A Bublik A Mannarino	2	1				4	T Brkić N Ćaćić	77	5	[10]
	WC	P Kotov R Safiullin	3	4				PR	D Inglot K Skupski	64	7	[8]
	PR	D Inglot K Skupski	6	6																		4	T Brkić N Ćaćić	5	6	[9]
		H Heliövaara M Middelkoop	6	6																			H Heliövaara M Middelkoop	7	4	[11]
	WC	A Karatsev R Muzaev	4	4					H Heliövaara M Middelkoop	6	2	[10]
		K Khachanov A Rublev	6	7					K Khachanov A Rublev	4	6	[7]
	3	L Saville J-P Smith	2	5												H Heliövaara M Middelkoop	64	6	[10]
		M Daniell M Demoliner	3	77	[7]											A Behar G Escobar	77	3	[8]
		A Behar G Escobar	6	63	[10]				A Behar G Escobar	7	3	[10]
		S González A Molteni	7	66	[10]				S González A Molteni	5	6	[7]
	2	A Golubev H Nys	5	78	[7]

External links

• Main draw