Andy Murray hauled Great Britain level in their Davis Cup semi-final with Argentina following his comprehensive defeat of Guido Pella on Sunday. The world number two, who had played over eight hours of tennis over the previous two days, had to leave the court for a medical timeout in the third set.
But he returned to wrap up a 6-3, 6-2, 6-3 victory over Pella in the first reverse singles rubber to make it 2-2 in the best-of-five tie.
It gives defending champions Great Britain hope of pulling off a repeat of their win over Russia in Coventry in April 2013 when they also came back from 2-0 down to win the tie 3-2.
Dan Evans was to face Leonardo Mayer, a late replacement for Juan Martin del Potro, in the deciding rubber.
The winners will face Croatia in November's final. The South Americans had led 2-1 going into Sunday's reverse singles following wins for del Potro and Pella in Friday's singles.