Juan Martin del Potro gave Argentina the lead against Great Britain in the Davis Cup semifinal in a thrilling match.
Del Potro won 6-4 5-7 6-7 (5-7) 6-3 6-4 after five hours and seven minutes to put Argentina 1-0 up in Glasgow.
British number two Kyle Edmund takes on Argentine number one Guido Pella in Friday’s second singles match.
The winners of the best-of-five tie will face France or Croatia in the final.
“I won but I still remember Olympic final,” said Del Potro. “This is very important to me and my team and we are looking to reach another final in the Davis Cup.
“Against Andy you never know when the match will finish. He is a dangerous player, a fighter and great champion. In end I played good forehands and good serves and that was key.”