Team Europe's captain Bjorn Borg, left, chats with Team World's captain John McEnroe prior to Laver Cup tennis competition, Sunday, Sept. 26, 2021, in Boston. (AP Photo/Elise Amendola)

Team Europe celebrates after they defeated Team World for the Laver Cup in tennis, Sunday, Sept. 26, 2021, in Boston. At top from left, are Daniil Medvedev, Mateo Berrettini, Stefanos Tsitsipas, vice captain Thomas Enqvist, and Casper Ruud. At bottom from left, Feliciano Lopez, Andrey Rublev, Alexander Zverev, and captain Bjorn Borg. (AP Photo/Elise Amendola)

Team Europe's captain Bjorn Borg, left, chats with tennis great Rod Laver, middle, and Team World's captain John McEnroe and vice captain Patrick McEnroe, far right, after Laver Cup tennis competition, Sunday, Sept. 26, 2021, in Boston. (AP Photo/Elise Amendola)

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 World's captain John McEnroe watches competition against Team Europe during Laver Cup tennis, Sunday, Sept. 26, 2021, in Boston. (AP Photo/Elise Amendola)

Tennis great Roger Federer watches the Laver Cup presentation from court side after Team Europe defeated Team World in Laver Cup tennis, Sunday, Sept. 26, 2021, in Boston. (AP Photo/Elise Amendola)

Tennis great Rod Laver, left, presents Team Europe's captain Bjorn Borg with the Laver Cup after they defeated Team World in Laver Cup tennis, Sunday, Sept. 26, 2021, in Boston. (AP Photo/Elise Amendola)