Andy Murray goes into his showdown with Sam Querrey with Great Britain standing on the verge of making the Davis Cup quarter-finals for the first time in nearly three decades.
If the world number four beats the world number 45 - and he has won five of their six previous encounters - then a first victory over the USA since 1935 would be secure, a run that's even longer than the wait Murray ended for a British men's singles winner at Wimbledon.
American pairing Bob and Mike Bryan kept the tie alive, following singles wins for Murray and James Ward on Friday, with a 6-2, 6-3, 3-6, 6-1 doubles victory over Colin Fleming and Dom Inglot.
Murray had been due to play but captain Leon Smith decided to give a Davis Cup debut to Inglot, a recent Grand Slam quarter-finalist who played Paul Bettany's tennis double in the film Wimbledon, and rest the Scot for Sunday's now decisive action.
"Andy is the heavy favourite, but Sam can beat anyone," admitted Mike Bryan.
"He has one of the biggest serves in the world. He is going to play with less pressure than yesterday and maybe Andy might be a little off.
"Andy is a grand slam champ, but Sam has beaten him before."
Meanwhile, Smith admitted his decision to rest Murray was taken in consultation with the British number one, who has only just returned to competitive action following back surgery.
"It was a two-way thing both for me and from Andy," he said.
"I talked to these guys Colin and Dom about it, and I thought it was the right decision. Andy doesn't have anything to worry about, nothing barring the usual stiffness and tiredness.
"But I thought it was best to rest Andy and keep him for tomorrow. We're in a really good position 2-1 up away from home against USA, and I think we've got a great chance."
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