Doubles
2021 MercedesCup
Final
Champions	Marcelo Demoliner Santiago González
Runners-up	Ariel Behar Gonzalo Escobar
Score	4–6, 6–3, [10–8]
Details
Draw	16
Seeds	4
Events
Singles Doubles
← 2019 · Stuttgart Open · 2022 →

Marcelo Demoliner and Santiago González defeated Ariel Behar and Gonzalo Escobar in the final, 4–6, 6–3, [10–8], to win the doubles tennis title at the 2021 Stuttgart Open. It was their second title as a team, their first in three years. Behar and Escobar were contesting for their third title of the season.^[1]

John Peers and Bruno Soares were the defending champions from when the tournament was last held in 2019,^[2] but Peers chose not to participate. Soares played alongside Jamie Murray but lost in the first round to Demoliner and González ^[1]

	First round							Quarterfinals							Semifinals							Final
	1	J Murray B Soares	2	6	[7]
	Alt	M Demoliner S González	6	3	[10]			Alt	M Demoliner S González	6	6
		H Hurkacz Ł Kubot	6	6					H Hurkacz Ł Kubot	4	4
	Alt	O Marach A-u-H Qureshi	3	4											Alt	M Demoliner S González	77	65	[10]
	3	R Klaasen B McLachlan	4	6	[8]										Alt	M González A Molteni	63	77	[6]
	WC	A Begemann D Brown	6	3	[10]			WC	A Begemann D Brown	77	4	[6]
	Alt	M González A Molteni	65	6	[10]			Alt	M González A Molteni	65	6	[10]
	Alt	F Auger-Aliassime N Monroe	77	3	[8]																	Alt	M Demoliner S González	4	6	[10]
	Alt	N Basilashvili D Sharan	4	2																		Alt	A Behar G Escobar	6	3	[8]
	Alt	A Behar G Escobar	6	6				Alt	A Behar G Escobar	710	77
	Alt	F Nielsen J-J Rojer	5	712	[4]			4	M Daniell P Oswald	68	65
	4	M Daniell P Oswald	7	610	[10]										Alt	A Behar G Escobar	77	1	[14]
	WC	Y Hanfmann D Koepfer	6	4	[10]											M Čilić I Dodig	65	6	[12]
	Alt	L Saville J Thompson	1	6	[7]			WC	Y Hanfmann D Koepfer
		M Čilić I Dodig	64	6	[10]				M Čilić I Dodig	w/o
	2	J Chardy F Martin	77	4	[8]

• Main draw