World Group I
Romania vs. Czech Republic (2-3)
Just as the Romanian team looked like it would pull off the biggest upset of its history, the defending Fed Cup champions came back from a 1-2 deficit to continue their historic run.
Karolina Pliskova rose to the occasion and contributed to all three points of the team's win. She came out swinging and scored the first point against Simona Halep, who had postponed nose surgery to support Romania in the tie. Romania's Halep and Monica Niculescu grabbed the next two points, each scoring a win over Petra Kvitova making it. Pliskova got the Czechs on even footing with a win against Niculescu, before the fight was clinched in the deciding doubles rubber.
This team???thanks to everyone in this team amazing week again and also to all fans for supporting us?? pic.twitter.com/C6upqVLLUe
Germany vs. Switzerland (2-3)
Playing as visitors in Leipzig Germany, Bencic held her nerve against two German heavyweights - No.23 Andrea Petkovic and Australian Open Champion Angelique Kerber - to win her two singles matches, putting Switzerland ahead 2-1 after Kerber defeated Timea Bacsinszky. Germany's Annika Beck leveled the score at 2-2 with a victory over Bacsinszky, leaving the doubles match to decide the tie.
"It feels awesome next to Belinda to play with her now and [win] the deciding point," Hingis told FedCup.com.
"It was tough at the beginning for me to be on the side bench for the first four matches, you are cheering them on and then you've got to go out. It took me a little while to get used to it but I feel I had great support from her."
Switzerland will play the Czech Republic in the next round.
France vs. Italy (4-1)
Caroline Garcia dominated all her matches in singles and doubles, booking France's spot in the final four for the second straight year.
Kristina Mladenovic put the home side in a tough spot, dropping the opening match against Italy's Camila Giorgi, but Garcia leveled the tie with a win over Sara Errani. Mladenovic found redemption the next day by closing out Errani to put France ahead 2-1, before Garcia won the decisive point against Giorgi and sent France into the semifinals.
"I feel very happy, and it's been a great week," Garcia told FedCup.com after the victory. "It's not every day you beat Italy 4-1. We are pretty proud."
? WTA (@WTA) February 7, 2016
Russia vs. Netherlands (1-3)
Kiki Bertens pulled off two stunning upsets in Moscow to send last year's finalists crashing out and put the Netherlands into their first Fed Cup semifinal since 1997.
She opened the tie with a straight sets win over Russia's Ekaterina Makarova, before her countrywoman Richel Hogenkamp emerged victorious in a four-hour marathon match against Svetlana Kuznetsova to put the Netherlands ahead 2-0. Kuznetsova came back the next day but fell short against Bertens, giving the Dutch team an unassailable 3-0 lead and the group's first semifinal berth. Makarova and Daria Katatkina claimed Russia's only point in the doubles rubber.
"This is unbelievable," Bertens told FedCup.com after the tie. "I don't think anyone expected that we could win this tie, perhaps we even didn't. It's an unbelievable feeling."
Netherlands is set to play France in the semifinals.
? WTA (@WTA) February 7, 2016
World Group II
The victories were more one-sided in World Group II for the USA and Spain, who both advanced with shutout victories.
Venus Williams and Sloane Stephens rattled off three straight-sets singles wins for the United States to seal the tie and give their country a place in the World Group play-offs. Spain booked their spot in a similar manner, with Garbiñe Muguruza and Carla Suárez Navarro sweeping their opponents in straight sets for a 3-0 victory over Serbia.
Sam Stosur powered Australia to a close 3-2 victory over Slovakia, winning her two singles matches over Anna Karolina Schmiedlova and Jana Cepelova before teaming up with Casey Dellacqua to claim the decisive point in doubles.
Belarus came back from a 1-2 deficit to win over Canada, booking their spot in the World Group II play-offs. Aliaksandra Sasnovich contributed to all three of Belarus' points, winning two singles matches and the doubles decider with Olga Govortsova.