Founded in 1900, Davis Cup by Rakuten has grown to become the largest annual world championship in sport, with 142 nations entered in 2021. The new Finals format, which sees the top 18 nations compete to be crowned Davis Cup champions, was introduced in 2019 with Spain winning the title in Madrid. The 2021 Finals - held from 25 November until 5 December - will see the 2019 semi-finalists and two wild card nations joined by the 12 winning teams from the 2020 Qualifiers. Madrid will be the host city for the group stage, quarter-finals, semi-finals and final of this year's edition, while Innsbruck (Austria) and Turin (Italy) will be host cities for the group stage and the quarter-finals. The Finals have been held since 2019 with the support of the Greater Madrid and Madrid City Council.