Roberta Vinci sent Italy into the Fed Cup final with a 6-3 6-7 6-3 victory over Czech Republic's Lucie Safarova in Palermo.
Russia came back from the brink to beat Slovakia 3-2 in a dramatic Fed Cup semi-final by sweeping the last three rubbers.
Defeats for Laura Robson and Elena Baltacha saw Great Britain lose their Fed Cup World Group II play-off to Argentina.
Czech Republic's hopes of a third consecutive Fed Cup title are receding fast as Italy surged 2-0 ahead in their semi-final.
Great Britain's Fed Cup Captain Judy Murray named Laura Robson and Johanna Konta as her singles players to face Argentina.
Laura Robson beat Florencia Molinero 6-1 6-1 to level Great Britain's Fed Cup play-off tie against Argentina.
Heather Watson is upset after being ruled out of Britain's Fed Cup play-off with Argentina, but has backed her team-mates.
Laura Robson heads Britain's team for the Fed Cup play-off in Argentina which Heather Watson will miss with glandular fever.
Great Britain will travel to Argentina in the Fed Cup World Group II play-offs in April.
Russia held their nerves in the deciding doubles match to beat Japan in Moscow to make the semi-finals of the Fed Cup.
Laura Robson and Heather Watson won as Great Britain downed Hungary in the Fed Cup to reach the play-offs in Israel.
Petra Kvitova and Lucie Safarova handed holders Czech Republic a 2-0 lead over Australia in the Fed Cup.
Laura Robson dropped just six games in two matches as Great Britain won their Fed Cup match against Portugal in Israel.
Marion Bartoli has a fever and is "highly unlikely" to make her long-awaited return for France in the Fed Cup against Germany.
Heather Watson and Laura Robson booked Britain a place in the Fed Cup World Group II play-offs at the expense of Bulgaria.
The fourth singles match in a Fed Cup tie will be scrapped if a team has an unassailable 3-0 lead.