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2021 MercedesCup
Date	8–13 June
Edition	43rd
Category	ATP Tour 250
Draw	28S / 16D
Prize money	€543,210
Surface	Grass
Location	Stuttgart, Germany
Venue	Tennis Club Weissenhof
Champions
Singles
Marin Čilić[1]
Doubles
Marcelo Demoliner / Santiago González[2]
← 2019 · Stuttgart Open · 2022 →

The 2021 MercedesCup was a men's tennis tournament played on outdoor grass courts. It was the 43rd edition of the Stuttgart Open, and part of the ATP Tour 250 series of the 2021 ATP Tour. It was held at the Tennis Club Weissenhof in Stuttgart, Germany, from 8 June until 13 June 2021. Unseeded Marin Čilić won the singles title.

• Marin Čilić defeated Félix Auger-Aliassime, 7–6^(7–2), 6–3

• Marcelo Demoliner / Santiago González defeated Ariel Behar / Gonzalo Escobar, 4–6, 6–3, [10–8]

Event	W	F	SF	QF	Round of 16	Round of 32	Q	Q2	Q1
Singles	250	150	90	45	20	0	12	6	0
Doubles					0	—	—	—	—

Event	W	F	SF	QF	Round of 16	Round of 32	Q2	Q1
Singles	€53,280	€38,200	€27,195	€18,130	€11,660	€7,010	€3,425	€1,780
Doubles*	€19,880	€14,240	€9,390	€6,090	€3,580	—	—	—

_{*per team}

Country	Player	Rank1	Seed
CAN	Denis Shapovalov	14	1
POL	Hubert Hurkacz	17	2
CAN	Félix Auger-Aliassime	21	3
AUS	Alex de Minaur	22	4
GEO	Nikoloz Basilashvili	30	5
FRA	Ugo Humbert	31	6
FRA	Adrian Mannarino	36	7
AUS	John Millman	43	8

• ¹ Rankings are as of 31 May 2021.^[3]

The following players received wildcards into the main draw:

• Dustin Brown
• Yannick Hanfmann
• Rudolf Molleker
• Jurij Rodionov
• Dominic Stricker

The following players received entry from the qualifying draw:

• Radu Albot
• Altuğ Çelikbilek
• James Duckworth
• Peter Gojowczyk

The following player received entry as a lucky loser:

• Ilya Ivashka

Before the tournament

• Alexander Bublik → replaced by Alexei Popyrin
• Taylor Fritz → replaced by Marin Čilić
• Cristian Garín → replaced by Jordan Thompson
• Aslan Karatsev → replaced by Jérémy Chardy
• Reilly Opelka → replaced by Lloyd Harris
• Benoît Paire → replaced by Sam Querrey
• Milos Raonic → replaced by Márton Fucsovics
• Jannik Sinner → replaced by Dominik Koepfer
• Lorenzo Sonego → replaced by Guido Pella
• Jan-Lennard Struff → replaced by Feliciano López
• Stan Wawrinka → replaced by Ilya Ivashka
• Alexander Zverev → replaced by Gilles Simon

• Peter Gojowczyk

Country	Player	Country	Player	Rank1	Seed
GBR	Jamie Murray	BRA	Bruno Soares	33	1
FRA	Jérémy Chardy	FRA	Fabrice Martin	58	2
RSA	Raven Klaasen	JPN	Ben McLachlan	67	3
NZL	Marcus Daniell	AUT	Philipp Oswald	75	4

• ¹ Rankings are as of 31 May 2021.

The following pairs received wildcards into the doubles main draw:

• Andre Begemann / Dustin Brown
• Yannick Hanfmann / Dominik Koepfer

The following pairs received entry as alternates:

• Félix Auger-Aliassime / Nicholas Monroe
• Nikoloz Basilashvili / Divij Sharan
• Ariel Behar / Gonzalo Escobar
• Marcelo Demoliner / Santiago González
• Máximo González / Andrés Molteni
• Hubert Hurkacz / Łukasz Kubot
• Oliver Marach / Aisam-ul-Haq Qureshi
• Frederik Nielsen / Jean-Julien Rojer
• Luke Saville / Jordan Thompson

Before the tournament

• Rohan Bopanna / Franko Škugor → replaced by Oliver Marach / Aisam-ul-Haq Qureshi
• Alexander Bublik / Reilly Opelka → replaced by Ariel Behar / Gonzalo Escobar
• Sander Gillé / Joran Vliegen → replaced by Máximo González / Andrés Molteni
• Wesley Koolhof / Jean-Julien Rojer → replaced by Frederik Nielsen / Jean-Julien Rojer
• Sebastian Korda / Rajeev Ram → replaced by Marcelo Demoliner / Santiago González
• Kevin Krawietz / John Peers → replaced by Félix Auger-Aliassime / Nicholas Monroe
• Łukasz Kubot / Marcelo Melo → replaced by Hubert Hurkacz / Łukasz Kubot
• Adrian Mannarino / Benoît Paire → replaced by Nikoloz Basilashvili / Divij Sharan
• Tim Pütz / Michael Venus → replaced by Luke Saville / Jordan Thompson

During the tournament

• Yannick Hanfmann / Dominik Koepfer

• Official website
• ATP tournament profile