Team Europe's Andrey Rublev, left, and Alexander Zverev hold the Laver Cup aloft after they defeated Team World for tennis' Laver Cup, Sunday, Sept. 26, 2021, in Boston. Looking on, at right, is tennis great Rod Laver, and at far right, Team World captain John McEnroe. (AP Photo/Elise Amendola)

Team Europe's Alexander Zverev, of Germany, returns the ball to Team World's John Isner, of the USA, during Laver Cup tennis, Saturday, Sept. 25, 2021, in Boston. (AP Photo/Elise Amendola)