GHENT, Belgium (AP) — 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.