Camila Giorgi earned the decisive third point for Italy against France in Alghero.
Giorgi routed Harmony Tan 6-2, 6-0. Tan was given her cup debut ahead of Alize Cornet, but Giorgi was in a dominating mood. Italy has won six successive ties.
"We are not just happy; we are in seventh heaven," Italy captain Tathiana Garbin said.
France has lost three straight ties since winning the 2019 final.
Kazakhstan upset visiting Germany in Nur-Sultan when Elena Rybakina overhauled Angelique Kerber 4-6, 6-3, 7-5. Kerber, trying to keep Germany alive, broke for 5-3 in the decider but Rybakina suddenly produced her best tennis in front of raucous support and won the last four games.
The Kazakhs won 3-1.
The Czechs were taken the distance by Britain and prevailed 3-2 in Prague.
The makeshift pair of Karolina Muchova, playing her first cup doubles since 2019, and Marketa Vondrousova, playing her first cup doubles, beat Harriet Dart and Katie Swan 6-1, 7-5.
Vondrousova, the 2019 French Open finalist appearing at her home club, started the day by drubbing U.S. Open champion Emma Raducanu 6-1, 6-1.
Raducanu took a medical timeout after the first set for a blister on her right foot which worsened.
Dart kept Britain in the tie with her first cup singles win when she beat 16-year-old Czech debutant Linda Fruhvirtova 6-0, 5-7, 6-2 in two-plus hours.
After a short break, Dart went out for the doubles, her third match in two days, but Vondrousova trumped her by winning all three Czech points.
Spain advanced without dropping a set against the host Netherlands in 's-Hertogenbosch.
Sara Sorribes Tormo earned a second point when she defeated Arantxa Rus 6-0, 6-4 in the first reverse singles. Spain wrapped up a 4-0 win after taking the doubles, too.
Leylah Fernandez secured Canada's place in the finals for a second straight year when she clinched the third point against Latvia with two matches to spare. Fernandez beat Daniela Vismane 6-2, 6-1 for her second singles win in her Vancouver hometown.
In Asheville, Asia Muhammad and Jessica Pegula defeated Lyudmyla Kichenok and Dayana Yastremska 7-6 (5), 6-3 in the final match of the tie to lift the United States over Ukraine 3-2.
Ukraine entered the day down 2-0 after singles wins by Pegula and Alison Riske on Friday, but the tables quickly turned in the reverse singles on Saturday as Yastremska beat Pegula 6-3, 6-4 to keep Ukraine's hopes alive.
Katarina Zavatska then upended Shelby Rogers 6-3, 6-4 in the second match to level the tie for Ukraine before the U.S. rallied in the doubles to clinch the tie.