{{refimprove|date=May 2021}}

{{Infobox tennis event|2021|MercedesCup| | date= 8–13 June | edition= 43rd | category= [[ATP Tour 250]] | draw= 28S / 16D | prize_money=€543,210 | surface= [[Grass court|Grass]] | location= [[Stuttgart]], Germany | venue= [[Tennis Club Weissenhof]] | champs= {{flagicon|CRO}} [[Marin Čilić]]<ref name="ms">{{cite web |title=2021 Stuttgart – Singles draw |url=https://www.atptour.com/en/scores/archive/stuttgart/321/2021/draws?matchtype=singles |publisher=Association of Tennis Professionals (ATP)}}</ref> | champd= {{flagicon|BRA}} [[Marcelo Demoliner]] / {{flagicon|MEX}} [[Santiago González (tennis)|Santiago González]]<ref name="md">{{cite web |title=2021 Stuttgart – Doubles draw |url=https://www.atptour.com/en/scores/archive/stuttgart/321/2021/draws?matchtype=doubles |publisher=Association of Tennis Professionals (ATP)}}</ref> | main_name= Stuttgart Open | before_year= 2019 }}

The '''2021 MercedesCup''' was a men's [[tennis]] tournament played on outdoor [[grass court|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.

== Finals == === Singles === {{main|2021 MercedesCup – Singles}} * {{flagicon|CRO}} [[Marin Čilić]] defeated {{flagicon|CAN}} [[Félix Auger-Aliassime]], 7–6<sup>(7–2)</sup>, 6–3

=== Doubles === {{main|2021 MercedesCup – Doubles}} * {{flagicon|BRA}} [[Marcelo Demoliner]] / {{flagicon|MEX}} [[Santiago González (tennis)|Santiago González]] defeated {{flagicon|URU}} [[Ariel Behar]] / {{flagicon|ECU}} [[Gonzalo Escobar]], 4–6, 6–3, [10–8]

== Points and prize money ==

=== Point distribution === {|class=wikitable style=font-size:90%;text-align:center |- | style="width:130px; background:#dfe2e9;"|'''Event''' | style="width:80px; background:lime;"|'''W''' | style="width:85px; background:thistle;"|F | style="width:85px; background:#ff0;"|SF | style="width:85px; background:#ffebcd;"|QF | style="width:85px; background:#afeeee;"|Round of 16 | style="width:85px; background:#afeeee;"|Round of 32 |width=85 |Q |width=85 |Q2 |width=85 |Q1 |- ! style="background:#ededed;"| Singles |rowspan=2|250 |rowspan=2|150 |rowspan=2|90 |rowspan=2|45 |20 |0 |12 |6 |0 |- ! style="background:#ededed;"| Doubles | 0 | {{n/a}} | {{n/a}} | {{n/a}} | {{n/a}} |}

=== Prize money ===

{|class=wikitable style=font-size:90%;text-align:center |- | style="width:130px; background:#dfe2e9;"|'''Event''' | style="width:80px; background:lime;"|'''W''' | style="width:85px; background:thistle;"|F | style="width:85px; background:#ff0;"|SF | style="width:85px; background:#ffebcd;"|QF | style="width:85px; background:#afeeee;"|Round of 16 | style="width:85px; background:#afeeee;"|Round of 32 |width=85 |Q2 |width=85 |Q1 |- | style="background:#ededed;"|'''Singles''' |€53,280 |€38,200 |€27,195 |€18,130 |€11,660 |€7,010 |€3,425 |€1,780 |- | style="background:#ededed;"|'''Doubles*''' |€19,880 |€14,240 |€9,390 |€6,090 |€3,580 | {{n/a}} | {{n/a}} | {{n/a}} |} <sub>*per team</sub>

==ATP singles main draw entrants==

===Seeds=== {| class="wikitable" border="1" |- ! width="70"| Country ! width="175"| Player ! Rank<sup>1</sup> ! Seed |- |{{flag|CAN}} |[[Denis Shapovalov]] |14 |1 |- |{{flag|POL}} |[[Hubert Hurkacz]] |17 |2 |-bgcolor=#fcc |{{flag|CAN}} |[[Félix Auger-Aliassime]] |21 |3 |- |{{flag|AUS}} |[[Alex de Minaur]] |22 |4 |- |{{flag|GEO}} |[[Nikoloz Basilashvili]] |30 |5 |- |{{flag|FRA}} |[[Ugo Humbert]] |31 |6 |- |{{flag|FRA}} |[[Adrian Mannarino]] |36 |7 |- |<s>{{flag|AUS}}</s> |<s>[[John Millman]]</s> |<s>43</s> |<s>8</s> |} *<sup>1</sup> Rankings are as of 31 May 2021.<ref>{{cite news|url=https://www.tennisnet.com/en/news/mercedescup-2021-nick-kyrgios-confirms-start-zverev-and-sinner-are-waiting-for-paris|title=MercedesCup 2021: Nick Kyrgios confirms start, Zverev and Sinner are waiting for Paris|website=tennisnet.com|date=11 May 2021}}</ref>

===Other entrants=== The following players received [[Wild card (sports)|wildcard]]s into the main draw: * {{flagicon|GER}} [[Dustin Brown (tennis)|Dustin Brown]] * {{flagicon|GER}} [[Yannick Hanfmann]] * {{flagicon|GER}} [[Rudolf Molleker]] * {{flagicon|AUT}} [[Jurij Rodionov]] * {{flagicon|SUI}} [[Dominic Stricker]]

The following players received entry from the qualifying draw: * {{flagicon|MDA}} [[Radu Albot]] * {{flagicon|TUR}} [[Altuğ Çelikbilek]] * {{flagicon|AUS}} [[James Duckworth (tennis)|James Duckworth]] * {{flagicon|GER}} [[Peter Gojowczyk]]

The following player received entry as a lucky loser: * {{flagicon|BLR}} [[Ilya Ivashka]]

=== Withdrawals === ;Before the tournament * {{flagicon|KAZ}} [[Alexander Bublik]] → replaced by {{flagicon|AUS}} [[Alexei Popyrin]] * {{flagicon|USA}} [[Taylor Fritz]] → replaced by {{flagicon|CRO}} [[Marin Čilić]] * {{flagicon|CHI}} [[Cristian Garín]] → replaced by {{flagicon|AUS}} [[Jordan Thompson (tennis)|Jordan Thompson]] * {{flagicon|RUS}} [[Aslan Karatsev]] → replaced by {{flagicon|FRA}} [[Jérémy Chardy]] * {{flagicon|USA}} [[Reilly Opelka]] → replaced by {{flagicon|RSA}} [[Lloyd Harris (tennis)|Lloyd Harris]] * {{flagicon|FRA}} [[Benoît Paire]] → replaced by {{flagicon|USA}} [[Sam Querrey]] * {{flagicon|CAN}} [[Milos Raonic]] → replaced by {{flagicon|HUN}} [[Márton Fucsovics]] * {{flagicon|ITA}} [[Jannik Sinner]] → replaced by {{flagicon|GER}} [[Dominik Koepfer]] * {{flagicon|ITA}} [[Lorenzo Sonego]] → replaced by {{flagicon|ARG}} [[Guido Pella]] * {{flagicon|GER}} [[Jan-Lennard Struff]] → replaced by {{flagicon|ESP}} [[Feliciano López]] * {{flagicon|SUI}} [[Stan Wawrinka]] → replaced by {{flagicon|BLR}} [[Ilya Ivashka]] * {{flagicon|GER}} [[Alexander Zverev]] → replaced by {{flagicon|FRA}} [[Gilles Simon]]

=== Retirements === * {{flagicon|GER}} [[Peter Gojowczyk]]

==ATP doubles main draw entrants==

===Seeds=== {|class="sortable wikitable" |- ! width="70"| Country ! width="175"| Player ! width="70"| Country ! width="175"| Player ! Rank<sup>1</sup> ! Seed |- |{{flag|GBR}} |[[Jamie Murray]] |{{flag|BRA}} |[[Bruno Soares]] |33 |1 |- |{{flag|FRA}} |[[Jérémy Chardy]] |{{flag|FRA}} |[[Fabrice Martin]] |58 |2 |- |{{flag|RSA}} |[[Raven Klaasen]] |{{flag|JPN}} |[[Ben McLachlan]] |67 |3 |- |{{flag|NZL}} |[[Marcus Daniell]] |{{flag|AUT}} |[[Philipp Oswald]] |75 |4 |} *<sup>1</sup> Rankings are as of 31 May 2021.

===Other entrants=== The following pairs received wildcards into the doubles main draw: * {{flagicon|GER}} [[Andre Begemann]] / {{flagicon|GER}} [[Dustin Brown (tennis)|Dustin Brown]] * {{flagicon|GER}} [[Yannick Hanfmann]] / {{flagicon|GER}} [[Dominik Koepfer]]

The following pairs received entry as alternates: * {{flagicon|CAN}} [[Félix Auger-Aliassime]] / {{flagicon|USA}} [[Nicholas Monroe]] * {{flagicon|GEO}} [[Nikoloz Basilashvili]] / {{flagicon|IND}} [[Divij Sharan]] * {{flagicon|URU}} [[Ariel Behar]] / {{flagicon|ECU}} [[Gonzalo Escobar]] * {{flagicon|BRA}} [[Marcelo Demoliner]] / {{flagicon|MEX}} [[Santiago González (tennis)|Santiago González]] * {{flagicon|ARG}} [[Máximo González]] / {{flagicon|ARG}} [[Andrés Molteni]] * {{flagicon|POL}} [[Hubert Hurkacz]] / {{flagicon|POL}} [[Łukasz Kubot]] * {{flagicon|AUT}} [[Oliver Marach]] / {{flagicon|PAK}} [[Aisam-ul-Haq Qureshi]] * {{flagicon|DNK}} [[Frederik Nielsen]] / {{flagicon|NED}} [[Jean-Julien Rojer]] * {{flagicon|AUS}} [[Luke Saville]] / {{flagicon|AUS}} [[Jordan Thompson (tennis)|Jordan Thompson]]

===Withdrawals=== ;Before the tournament * {{flagicon|IND}} [[Rohan Bopanna]] / {{flagicon|CRO}} [[Franko Škugor]] → replaced by {{flagicon|AUT}} [[Oliver Marach]] / {{flagicon|PAK}} [[Aisam-ul-Haq Qureshi]] * {{flagicon|KAZ}} [[Alexander Bublik]] / {{flagicon|USA}} [[Reilly Opelka]] → replaced by {{flagicon|URU}} [[Ariel Behar]] / {{flagicon|ECU}} [[Gonzalo Escobar]] * {{flagicon|BEL}} [[Sander Gillé]] / {{flagicon|BEL}} [[Joran Vliegen]] → replaced by {{flagicon|ARG}} [[Máximo González]] / {{flagicon|ARG}} [[Andrés Molteni]] * {{flagicon|NED}} [[Wesley Koolhof]] / {{flagicon|NED}} [[Jean-Julien Rojer]] → replaced by {{flagicon|DNK}} [[Frederik Nielsen]] / {{flagicon|NED}} [[Jean-Julien Rojer]] * {{flagicon|USA}} [[Sebastian Korda]] / {{flagicon|USA}} [[Rajeev Ram]] → replaced by {{flagicon|BRA}} [[Marcelo Demoliner]] / {{flagicon|MEX}} [[Santiago González (tennis)|Santiago González]] * {{flagicon|GER}} [[Kevin Krawietz]] / {{flagicon|AUS}} [[John Peers]] → replaced by {{flagicon|CAN}} [[Félix Auger-Aliassime]] / {{flagicon|USA}} [[Nicholas Monroe]] * {{flagicon|POL}} [[Łukasz Kubot]] / {{flagicon|BRA}} [[Marcelo Melo]] → replaced by {{flagicon|POL}} [[Hubert Hurkacz]] / {{flagicon|POL}} [[Łukasz Kubot]] * {{flagicon|FRA}} [[Adrian Mannarino]] / {{flagicon|FRA}} [[Benoît Paire]] → replaced by {{flagicon|GEO}} [[Nikoloz Basilashvili]] / {{flagicon|IND}} [[Divij Sharan]] * {{flagicon|GER}} [[Tim Pütz]] / {{flagicon|NZL}} [[Michael Venus (tennis)|Michael Venus]] → replaced by {{flagicon|AUS}} [[Luke Saville]] / {{flagicon|AUS}} [[Jordan Thompson (tennis)|Jordan Thompson]]

;During the tournament * {{Flagicon|GER}} [[Yannick Hanfmann]] / {{Flagicon|GER}} [[Dominik Koepfer]]

== References == {{reflist}}

== External links == * {{Official website|https://www.mercedescup.de/en/}} * [http://www.atpworldtour.com/Tennis/Tournaments/Stuttgart.aspx ATP tournament profile]

{{ATP Stuttgart Outdoor tournaments}} {{2021 ATP Tour}}

[[Category:2021 ATP Tour|Stuttgart Open]] [[Category:Stuttgart Open]] [[Category:2021 in German tennis]] [[Category:June 2021 sports events in Germany|MercedesCup]]