The Davis Cup returns in 2021 after the
event’s cancellation last year due to covid. 2019 saw a big shakeup in what is billed as the World Cup of Tennis, when it moved from the traditional 16 team brackets to a new 18 team format. As controversial as that was, the Davis Cup won’t be outdone and have
adopted another new change in only the second outing since the last. This year the tournament will be held
simultaneously in three host cities, Madrid, Innsbruck, and Turin.
Source : https://en.as.com/en/2021/11/25/other_sports/1637821560_046126.html160