Andy Murray beat Sam Querrey in four sets Sunday to send Great Britain into the quarter-finals of the Davis Cup for the first time since 1986.
Wimbledon champion Murray posted his second singles victory of the tie, downing Querrey 7-6 (7/5), 6-7 (3/7), 6-1, 6-3 to capture the needed third point in the best-of-five match tie.
Britain had seized a commanding 2-0 lead on the opening day on Friday as 175th-ranked James Ward pulled off a remarkable comeback win over Querrey.
Ward won 10 of the last 11 games to grab the five-set triumph, after Murray had crushed Davis Cup newcomer Donald Young in straight sets.
Young was a late replacement in the US squad for injured John Isner.
The formidable doubles duo of Bob and Mike Bryan had kept the Americans alive with a doubles victory over Colin Fleming and Dominic Inglot on Saturday.
However, Querrey couldn't prevent Britain from posting their first Davis Cup win over the United States since 1935.
In the quarter-finals Britain will face Italy, who sealed a 3-1 victory over Argentina in Mar del Plata on Sunday.
The United States will face a playoff to remain in the elite World Group.