Great Britain will have to fight back to reach the Davis Cup Finals last eight at the earliest opportunity after Dan Evans lost their opening match against Argentina.
In a best-of-three tie, Evans was beaten 6-2 7-5 by Tomas Martin Etcheverry in Manchester.
US Open semi-finalist Jack Draper, who has returned to the team after being rested for Wednesday's win over Finland, plays Francisco Cerundolo in the second singles match.
If Draper wins, the tie will go down to a deciding doubles match.
Britain know they will progress to the quarter-finals - played in November at the 'Final Eight' event in Malaga - with two victories from two ties if they beat Argentina on the Manchester Arena hard court.