The tournament was initiated by Federer, a 19-time Grand Slam victor, as homage to the legendary Australian Rod Laver, the only double Grand Slam holder. Federer and Nadal teamed up on Saturday, putting aside a long-running rivalry to play doubles competitively for the first time, giving fans an eagerly anticipated treat. The Laver Cup, named after the Australian tennis icon and to be hosted by Chicago in 2018, features a unique format in which three singles and one doubles match are played on each of the tourney's three days and the points received per match victory increase every day.
Nadal, 31, said, "It was unforgettable for both of us after the history we have behind us as rivals".
Rafael Nadal jumping into the arms of Roger Federer, to be congratulated by Bjorn Borg, with John McEnroe looking on, and all in the name of Rod Laver. The occasion? Prague's Laver Cup, a brand-new event in which six European players go up against opponents from the rest of the world.
They started the doubles against Sam Querrey and Jack Sock on a high, earning a break in the first set to win 6-4.
A team had to gain at least 13 points to win the cup.
After Nadal and Federer had won their singles rubbers, all eyes at Prague's sold-out O2 Arena were then on the two legends who played on the same side of the net for the first time in careers which have stretched the best part of two decades.
Sock and Isner beat Berdych and Cilic 7-6 (7/5), 7-6 (8/6) with Sock's vicious forehand leading the charge on the American's 25th birthday.
Nadal and Federer capped the evening with a thrilling win over Querrey and Sock, even after an early miscue nearly caused Nadal to hit his partner as they both went for an overhead smash.
After Federer served to take the first set, the American pair flew through the second 6-1 with some big serves.
The Team World bench has stood out with players joking around, choreographing their celebrations after points and leading the crowd in the Mexican Wave.