2021 MercedesCup – Singles
tennis tournament event

Marin Čilić defeated Félix Auger-Aliassime in the final, 7–6(7–2), 6–3 to win the singles tennis title at the 2021 Stuttgart Open. It was Čilić's 19th career ATP Tour singles title, his first in three years, and he did not drop a set en route to the victory. The No. 47-ranked, 32-year-old Čilić also became the lowest-ranked winner since Juan Carlos Ferrero in 2011 and the third-oldest champion in tournament history. Defending finalist Auger-Aliassime was contesting for his first career singles title in his eighth final.
Matteo Berrettini was the reigning champion from when the event was last held in 2019, but he could not participate as he was still competing at the French Open upon the beginning of the tournament.
Seeds
The top four seeds received a bye into the second round.
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The record creator and administrative purpose are central evidence, because official documentation reflects both action and institutional priorities. The source revision retrieved here is dated Jun 18, 2023. The linked authority identifier is Q107147711. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2021, 2011 and 2019.
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This entry incorporates text from “2021 MercedesCup – Singles” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.