The Davis Cup by Rakuten Finals will take place across three cities on 25 November - 5 December in 2021. Madrid, Innsbruck and Turin will each host two of the six groups, with Madrid staging two quarter-finals, and Innsbruck and Turin one quarter-final each. The Spanish capital will also host the semi-finals and final.
https://www.daviscup.com/en/draws-results/finals/2021.aspx