Spain, the defending champion, Serbia, Russia and Argentina booked places in the Davis Cup by BNP Paribas World Group quarter-finals on Sunday. Meanwhile, Chile has a 2-1 lead over Israel ahead of the reverse singles rubbers.

Spain 4 Switzerland 1

Spain won its 21st consecutive tie on clay courts, after David Ferrer recorded his fourth straight win over Stanislas Wawrinka 6-2, 6-4, 6-0 in two hours and 34 minutes in the fourth rubber in Logrono.

Ferrer has been in stellar form recently, reaching the Copa Telmex final (l. to Ferrero) in Buenos Aires prior to gaining revenge over his Spanish compatriot in the Abierto Mexicano Telcel final in Acapulco. Nicolas Almagro made it 4-1 to Spain, now unbeaten in 19 home ties, with a 6-1, 6-3 win over Marco Chiudinelli in the fifth 'dead' rubber.

Serbia 3 United States 2

Serbia, an independent nation since 2007, has clinched its place in the quarter-finals for the first time, thanks to Novak Djokovic, who recorded a 7-5, 3-6, 6-3, 6-7(6), 6-4 win over American World No. 20 John Isner in four hours and 16 minutes.

In the fifth 'dead' rubber, American Sam Querrey beat Viktor Troicki 7-5, 6-2. Serbia now plays Croatia, a 5-0 winner of Ecuador, in the last eight from 9-11 July.

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Russia 3 India 2

Mikhail Youzhny recorded his second singles win of the tie to give Russia victory over India in Moscow. Russia has now reached the quarter-finals for the 11th time in 12 years and has extended its run of victories on home soil to 17 ties.

World No. 13 Youzhny, who finished runner-up to Djokovic at the Barclays Dubai Tennis Championships final last week, hit 15 winners to beat Somdev Devvarman 6-2, 6-1, 6-3 in one hour and 55 minutes. He improved to a 12-3 season record.

In the fifth 'dead' rubber, India's Rohan Bopanna hit 19 winners and eight aces past Teimuraz Gabashvili of Russia in a 7-6(5), 6-4 win over 80 minutes. Russia meets Argentina in the quarter-finals from 9-11 July.

Sweden 2 Argentina 3

Argentina completed a memorable 3-2 win over Sweden in Stockholm.

David Nalbandian, who had initially ruled himself out of the first round tie with a right leg injury, provided the heroics for Argentina by beating Andreas Vinciguerra 7-5, 6-3, 4-6, 6-4 in two hours and 35 minutes. Nalbandian, currently No. 154 in the South African Airways 2010 ATP Rankings, only arrived in the Swedish capital on Thursday and was playing in his first Davis Cup tie since the 2008 final.

In the first reverse singles rubber of the day, Robin Soderling improved to 11-3 in singles rubbers for Sweden after withstanding 25 aces from the racquet of World No. 73 Leonardo Mayer in a 7-5, 7-6(5), 7-5 victory in two hours and 32 minutes. Soderling also beat Eduardo Schwank in straight sets on Friday.

Chile 2 Israel 1

Jonathan Erlich and Andy Ram have given Israel a lifeline by clinching the doubles rubber against Chile in Coquimbo, after beating Jorge Aguilar and Paul Capdeville 6-7(5), 7-6(9), 2-6, 6-1, 6-0 in three hours and 15 minutes.

Chile's captain Hans Gildemeister elected to rest Fernando Gonzalez and Nicolas Massu. Gonzalez will play Dudi Sela of Israel in the first reverse singles rubber on Monday, while Massu is scheduled to meet Harel Levy in what could be a decisive final rubber.