Andy Murray gave Britain its first Davis Cup title in 79 years when he beat Belgium's David Goffin 6-3, 7-5, 6-3 in the first of reverse singles Sunday.
The win gave Britain an unassailable 3-1 lead in the best-of-five series and the final singles match was not played.
"I can't believe we did it," Murray said on court.
"We may never get an opportunity to do this again.
We should celebrate tonight."
Britain is the only nation to have competed in all Davis Cup editions since 1900 and its 10th title makes it the third most successful nation after the United States and Australia .