Great Britain will wait to decide whether to throw Andy Murray into a battle with the best doubles pairing in the world as they look to wrap up a Davis Cup victory over the United States.
Wins for Murray over Donald Young and, thrillingly, James Ward in five sets over Sam Querrey on Friday put the visiting British 2-0 up in the World Group tie and one point from a famous victory in San Diego.
Murray had been scheduled to line up alongside Bob and Mike Bryan in Saturday's doubles, but captain Leon Smith may opt to rest the British number one knowing a singles victory on Sunday - most likely against Querrey - would be enough.
Smith told BBC Sport after Friday's action: "That's a conversation that I'll have with the guys tonight and tomorrow morning. I'm pretty open about it."
Wimbledon champion Murray showed no ill effects from his Australian Open exertions and had no apparent problems adapting to the newly-laid clay at Petco Park, home of the San Diego Padres baseball team, as he raced to a 6-1 6-2 6-3 win.
World number 175 Ward's win was even more impressive, though, as he battled for more than three hours on his way to a 1-6 7-6 (7/3) 3-6 6-4 6-1 victory.
The big-serving Querrey, ranked 49th, was the clear favourite, but the English player justified the faith shown in him by Smith to record a famous success.
Ward told BBC Sport: "I love playing Davis Cup, I love playing for my country and that shows in my performances
"It's such a great win. I played well, dug in and gave myself a chance and in the end it worked."
Earlier, Young, the world number 79 who replaced the injured John Isner in the US team, had no answer to Murray's game as the Wimbledon champion wrapped up victory in the first rubber of the World Group first-round clash.
Murray went into the match on the back of a run to the quarter-finals in Melbourne and still feeling his way back into the rigours of the main tour after back surgery.
But he needed no time to find his feet on Friday as he broke twice in each set to finish the match in one hour 38 minutes.
Murray's win was the first time Britain had won a live singles rubber at a Davis Cup World Group tie since Tim Henman defeated Sweden's Jonas Bjorkman in 2002 in Birmingham.
And it was followed immediately by a second as Britain put themselves in an excellent position to claim their first Davis Cup win over the US since 1935.