World number three Vera Zvonareva put Russia into the Fed Cup final by beating Italy's Roberta Vinci 6-4, 6-2 here on Sunday. That gave the Russians an unassailable 3-0 lead over the defending champions having won both the opening singles on Saturday.
"I took account of my mistakes in the first set and improved on them," Zvonareva said. "I wanted so much to win today in front of our supporters to give our team the deciding point.
"I'm happy to win and to put our team into the final. It was one of the most eomotional wins of my career." Zvonareva, losing finalist last year at Wimbledon and in the US Open, started the match with an immediate break and took a 2-0 lead, but Errani broke back in the sixth game to level at three games all.
But the Russian broke again in the ninth game to take the opening set in 45 minutes. Games went with serve in the second set until the fifth game, when Zvonareva moved up a gear and broke her opponent's serve twice to take the set and the match.
In the Fed Cup final Russia will face the winner of the other semi-final showdown between Czech Republic and Belgium which the Czechs were leading 2-1 after the first of Sunday's two reverse singles.
Russia and Italy have dominated the premier women's team competition in recent times winning all seven titles contested since 2004, with Russia triumphant in 2004, 2005, 2007 and 2008 and Italy taking the prize in 2006, 2009 and 2010. Italian hopes, however, were badly hit by the absence of their top players.
Flavia Pennetta, who is 20th in the WTA rankings, missed the match in Moscow because of an injury, while world number four, the reigning French Open champion Francesca Schiavone, opted out to better prepare for the clay-court season.
There was an historic moment in the World Group playoffs when Germany's Andrea Petkovic's victory over Melanie Oudin of the United States on Sunday saw the 17-time winners drop out of the top flight for the first time in the competition's 48-year history.
The 23-year-old Petkovic needed just one hour 18 minutes to beat 19-year-old Oudin 6-2, 6-3, having already beaten teenager Christina McHale 6-3, 6-4 on Saturday.
Then Petkovic's team-mate Sabine Lisicki needed just 88 minutes to continue the hosts' domination later in the afternoon with a 6-3, 6-4 victory over McHale in the fourth rubber to give Germany a 4-0 lead. The United States have reached the Fed Cup final for the last two years but came to Stuttgart with an inexperienced squad.
The Americans were missing their three leading players, including both the Williams sisters - Serena and Venus Williams - as well as Bethanie Mattek-Sands, ranked 41st in the world. A similar fate met France who went down to Spain, Lourdes Dominguez Lino supplying the crucial win 6-4, 6-4 over Pauline Parmentier to put the home side 3-1 ahead and condemning the French to World Group II for the first time. Ukraine defeated Australia 3-2 in a tightly-fought play-off encounter, while Slovakia and Serbia were level 2-2.