Sweden accounted for Russia in Boras, Spain was yet to drop a set against Belgium in Charleroi, and Argentina nailed down Romania before 11,000 ecstatic fans in Buenos Aires.

In the other first-round ties, defending champion Serbia led India 2-1, the United States led Chile, Germany led Croatia, France led Austria, and the Czech Republic led Kazakhstan. Only France blew a chance to seal victory, losing its doubles to be extended into Sunday's reverse singles.

Sweden advanced to the last eight thanks to doubles specialists Simon Aspelin and Robert Lindstedt beating Igor Kunitsyn and Dmitry Tursunov 6-4, 6-7 (6), 7-6 (6), 6-2.

“I'm very proud of the guys,” Sweden captain Thomas Enqvist said. “This match could have gone either way but the guys played very well in the fourth set.” With Robin Soderling and Joachim Johansson having won their opening singles, Sweden set up a home quarterfinal against either Serbia or India. Sweden won the last of its seven titles in 1998 and has gone past the quarters only once in the last 10 years.

In that time, Spain has dominated the competition with three titles. With Rafael Nadal leading a team of three top-10 players, Spain overwhelmed Belgium, securing the win when Fernando Verdasco and Feliciano Lopez beat Steve Darcis and Olivier Rochus 7-6 (0), 6-4, 6-3 in front of a pro-Spanish crowd.

Victory allowed Nadal, in his first action in five weeks, the luxury of heading early to next week's big tour event in Indian Wells, California. But Spain will need him again in July, when it will travel to either the US or Chile.

Winning quickly also gave relief to David Nalbandian, who earned Argentina's first point on Friday with a four-set win despite a groin strain and leg injury. He watched teammates Juan Ignacio Chela and Eduardo Schwank beat Romania pair Victor Hanescu and Horia Tecau 6-2, 7-6 (8), 6-1 on Saturday to launch their bid at a third final in five years.

Next up, Argentina will host either the Czechs, who knocked them out in the 2009 quarters, or Kazakhstan.

Captain Tito Vazquez pumped up the crowd in Parque Roca.

“The dream of winning the Davis Cup will come true one day,” Vazquez told them. “I don't know when, but winning this is a first step.” In Novi Sad, Nenad Zimonjic and Ilija Bozoljac edged Rohan Bopanna and Somdev Devvarman 4-6, 6-3, 6-4, 7-6 (10) for Serbia to lead 2-1, but India continued to make life difficult for the titleholder playing without Novak Djokovic.

Devvarman and Serbia's Viktor Troicki, winners of their respective singles on Friday, meet in the first reverse singles on Sunday.

Austria avoided being swept by 2010 finalist France when Jurgen Melzer and Oliver Marach beat Michael Llodra and Julien Benneteau 6-4, 3-6, 6-3, 6-4, handing France its first doubles loss in two years in a Vienna hangar.

History still favors France, however. Austria has never beaten nine-time champion France, and it has never won a tie from 2-0 down, while France has never lost from 2-0 up.

In Santiago, Bob and Mike Bryan put the US ahead of Chile 2-1 with a 6-3, 6-3, 7-6 (4) win over Jorge Aguilar and Nicolas Massu, giving Andy Roddick a chance against Massu in Sunday's first match to win the tie.

Roddick, who took last year off from Davis Cup, has an 11-0 record when in position to clinch a tie.

The home team has always won when Germany and Croatia meet, but the former moved closer to ending that run after Christopher Kas and Philipp Petzschner outlasted Ivan Dodig and Ivo Karlovic 6-3, 3-6, 5-7, 6-3, 6-4 in 3 hours, 29 minutes in Zagreb.

Sunday's first match pits Marin Cilic against Philipp Kohlschreiber, who has a 4-2 record against the Croat.

In Ostrava, Tomas Berdych won his second point for the Czechs when he and Lukas Dlouhy defeated Evgeny Korolev and Yuriy Schukin of Kazakhstan 6-4, 6-4, 7-6 (4). Berdych, playing three matches in a tie for a fifth time, can win it on Sunday against Andrey Golubev.