The US maintained their hopes of staging a dramatic comeback in their Davis Cup tie against Great Britain after Bob and Mike Bryan defeated Dominic Inglot and Jamie Murray in a five-set thriller in Glasgow.
The 16-time grand slam champions stormed into a two set lead but the Brits – playing their first professional match as a pair – drew level amid a remarkable revival, however the US duo eventually came through 6-3 6-2 3-6 6-7 9-7.
Though the result means US remain in the tie, trailing 2-1, ahead of the final two singles matches on Sunday, Andy Murray can send GB through to the quarter-finals should he defeat John Isner in the first rubber of day three.
And ahead of that potential last eight clash in the World Group, Inglot and Murray gave Britain genuine hope ahead of any future ties with a fine display against the finest doubles pair in tennis history.
US captain Jim Courier told BBC Sport: "In the first two sets Bob and Mike play as well as they can play but credit to Dom and Jamie they stuck in there and made it really difficult for us. We like these kinds of tussles but we'd prefer four sets instead of five.
"He [John] feels good today he knows he has to play he has to play some of his best tennis to stand a chance. You want to test yourself against the best and that is what tomorrow will be for John."
GB skipper Leon Smith added: "It shows how far they have come as individuals, as tour players to play that level of match against the best team there has ever been, the best team in the world. It bodes well for their futures and I am very proud of them.
"It is important that we don't have a one-man show. As much as Andy has led us to these moments, James is pitching in all the time, our doubles guys are going to get better. They've got a few years to catch up and once they reflect on this they'll realise how good they are."