Great Britain was defeated 2-1 by the United States in their Davis Cup group opener after Andy Murray and Joe Salisbury lost a late-night doubles match decision.
Rajeev Ram and Jack Sock defeated the duo 5-7 6-4 7-5 to break the agonizingly tight tie as the clock in Glasgow approached 01:00 BST.
After Tommy Paul defeated Dan Evans, the British player Cameron Norrie rallied to beat Taylor Fritz to draw the game.
GB has two more matches in Glasgow as they prepare for the knockout round in November.
Following the passing of Queen Elizabeth II, a moment of respect was observed at the opening of the Emirates Arena.
The British players will wear black armbands or ribbons for all three Group D matches this week.
As they compete for one of the two qualifying berths in the group, Great Britain will face the Netherlands on Friday and Kazakhstan on Sunday.
In a best-of-three-sets format, each country competes in two singles matches, and one doubles match against the opponents from their group.
Three more locations are hosting this week as 16 countries compete for spots in the Malaga finals.