Roger Federer and Alexander Zverev combined to beat Jack Sock and Denis Shapovalov 6-3, 7-5 to give Team Europe a 3-1 lead over Team World in the Laver Cup.
In the opening edition of the tournament in 2017, they played as doubles partners for the very first time.
Roger Federer earlier put Team Europe ahead by saving three match points for a 6-7, 7-6, (10-7) victory over John Isner.
Federer and Djokovic took the first set 7-6 in a tiebreaker, but Sock and Anderson won the second set 6-3 and then captured the deciding tiebreaker 10-6.
A six-player team from Europe will face a team of players from the rest of the world in the second year of the competition on Sept. 21-23.
Federer's management team was instrumental in launching the Laver Cup, which pits Team Europe against Team World.
The tournament is organized to honour the legendary Rod Laver, an 11-time major champion who won two calendar-year Grand Slams.
Team Europe ended the first day of competition with a 3-1 lead thanks to three singles win, but they suffered one doubles defeat.
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