Team Europe beat Team World 15-9 to win the inaugural Laver Cup in Prague.
Europe began the final day with a 9-3 lead, but, after a win apiece in the opening two matches on Sunday, John Isner beat Rafael Nadal 7-5 7-6 (7-1) to cut the advantage to 12-9.
Roger Federer then went to a match tie-break with Nick Kyrgios, who had a chance to force a deciding doubles.
However, Federer saved match point and won 4-6 7-6 (8-6) 11-9 to spark jubilant celebrations.
The competition, which follows a similar format to the Ryder Cup, saw Federer and Nadal play doubles together for the first time on Saturday.