World number two Novak Djokovic fired Serbia to a 2-0 lead over the United States in Belgrade with a 6-2, 7-6, 2-6, 6-3 victory over Sam Querrey, after compatriot Viktor Troicki's hard-fought win over John Isner, also in four sets.
Juan Carlos Ferrero completed a perfect two-week tour of South America with a 5-7, 6-4, 6-3 victory over fellow Spaniard and top seed David Ferrer in the Buenos Aires Open on Sunday.
Zverev's brother Mischa Zverev was also eliminated, going out 6-3, 6-1 to David Ferrer in the first round, while Kei Nishikori eased to a 7-5, 6-2 win over Taylor Fritz to secure a place in the third round.
Novak Djokovic was left sweating on a place in the semi-finals of the ATP World Tour Finals on Friday after losing for the first time in his career to fellow-Serb Janko Tipsarevic.
Rafael Nadal thanked his team-mates for giving him the chance to end a troubled season on a sweet note after Spain sealed victory in the Davis Cup final against Czech Republic on Saturday.
Spain secured their second successive Davis Cup triumph, and their fourth in all, when they extended their lead over Czech Republic to an unassailable 3-0 in Saturday's doubles.
Top 10 duo Rafael Nadal and Fernando Verdasco have returned to the Spain side for next month's Davis Cup final against Czech Republic, captain Albert Costa said on Monday.
US Davis Cup debutant Sam Querrey will face world number one Rafael Nadal in the opening rubber of the semi-final on Friday.
Rafael Nadal will lead Spain's challenge in the Davis Cup semi-final against the United States in Madrid next week.
Tommy Robredo and Feliciano Lopez upset Israeli doubles specialists Jonathan Erlich and Andy Ram 7-6, 6-7, 6-4, 6-2 to put champions Spain through to their fifth Davis Cup final in 10 years.
In his place, Tommy Robredo has been called up alongside David Ferrer, Feliciano Lopez and Fernando Verdasco.
Ninth seed Gilles Simon booked his place in the third round of the Cincinnati Masters on Tuesday after a 7-6, 6-7, 6-1 win over Russian Igor Andreev.
Injury-stricken Rafael Nadal and Wimbledon finalist Andy Roddick will be among the big names forced to miss the Davis Cup World Group quarter-finals starting on Friday.
Top seed Jo-Wilfried Tsonga swept to a 6-4, 6-1 victory over Brazilian Thiago Alves in the first round of the South African Open in Johannesburg on Tuesday. The Frenchman was joined in the second round by second seed David Ferrer, fifth seed Jeremy Chardy and seventh seed Kristof Vliegen.
Spain overcame the absence of world number one Rafael Nadal to clinch the Davis Cup on Sunday when Fernando Verdasco beat Jose Acasuso to give them a 3-1 win over Argentina in the final. Verdasco, brought in to replace Spain's off-form number one David Ferrer, won 6-3, 6-7, 4-6, 6-3, 6-1 to hand Argentina their third defeat in three final appearances and their first home loss for 10 years.
In men's doubles Bhupathi and Zimonjic will next play the US-Australian duo of Eric Butorac and Ashley Fisher.
The world number five Spaniard has won 15 straight matches since returning from a foot issue that sidelined him for nearly six months last year.
Six months on, with an Olympic silver medal in the bag, the Argentine beat 11th seed David Ferrer of Spain 7-6, 6-2, 6-3 to reach the US fourth round for the first time since 2012.
Israel's Dudi Sela played giant-killer again on Friday, upsetting sixth seed Tommy Robredo of Spain 6-4, 6-1 to sweep to his first ATP Tour semi-final at the $524,000 China Open.
Japanese outsider Kei Nishikori stole the spotlight on another day of shocks at the US Open on Saturday, while Venus and Serena Williams rolled towards a quarter-final showdown at Flushing Meadows. Fourth seed David Ferrer was left a punched out wreck as he went down 6-4, 6-4, 3-6, 2-6, 7-5 following an inspired performance by Nishikori.
Defending champion Paradon Srichaphan stormed into the last eight as seeds David Ferrer and Anthony Dupuis were upset in the Tata Open.
The Swiss beat David Ferrer 6-4, 6-0 at Monte Carlo Masters to clinch his 500th professional win.
Leander Paes and Mahesh Bhupathi kept Indian hopes alive in the Ordina Open by advancing to the doubles semi-finals, even as Sania Mirza and Rohan Bopanna bowed out of the singles in the US $175,000 tournament in s'Hertogenbosch, the Netherlands. The second seeded Indian pair produced glimpses of their old magic as they sailed past Spaniards David Ferrer and Marcel Granollers 6-2, 6-1 in 48 minutes to advance to the last four.
Spain's Rafael Nadal will have to counter the vinyl-covered wood-base floor during the Davis Cup tie against Switzerland.
Holder Roger Federer continued his trouble-free progress at the Hamburg Masters with a 6-3, 6-2 in over unseeded Swede Robin Soderling on Thursday.
Top seed Rafael Nadal produced a claycourt masterclass on Saturday to demolish German Denis Gremelmayr 6-1, 6-0 to reach the final of the Barcelona Open.
Top seed Rafael Nadal was stunned 3-6 6-3 6-4 by Italian Andreas Seppi in one of series of second-round upsets at the World Indoor Tournament on Thursday. Second seed Nikolay Davydenko of Russia, third seeded Spaniard David Ferrer and fifth seed Tomas Berdych of the Czech Republic also suffered early exits.
In other first round matches, at the World Indoor Tournament, second seed Nikolay Davydenko beat qualifier Jan Hernych while David Ferrer advanced with a victory over Italy's Simone Bolelli.
Fernando Verdasco found strength to haul his way back from a set and a break down to reach the final of the Barcelona Open with a 6-7, 7-5, 6-1 win over fellow Spaniard David Ferrer on Saturday. Under hot sun at the Reial Club de Tennis, Verdasco initially appeared to be feeling the effects of his run to the final at last week's Monte Carlo Masters but he dug deep to set up a clash with French Open runner-up Robin Soderling.
Novak Djokovic survived a late bout of nerves to beat Spanish fifth seed David Ferrer 6-0, 6-3, 7-5 on Wednesday and reach the Australian Open semi-finals. The Serbian third seed missed four match points and was broken when serving for victory but recovered to set up a semi-final against either world number one Roger Federer or American 12th seed James Blake.
Defending champion Novak Djokovic was knocked out of the Australian Open quarter-finals by Stanislas Wawrinka 2-6, 6-4, 6-2, 3-6, 9-7 on Tuesday.
The world number one's off-season preparation will now be geared towards breaking Pete Sampras's record of 14 Grand Slam singles titles in 2008.
The Swiss will play Nadal's countryman David Ferrer in Sunday's final at the showcase eight-man event in Shanghai following his 6-1, 6-3 thrashing of American Andy Roddick in the first semi-final.
World number two Rafael Nadal recovered from an unsteady start to overpower Marcos Baghdatis 6-4 6-4 in the Madrid Masters on Wednesday and set up a mouth-watering last-16 clash against Andy Murray.
Venus Williams suffered a shock 4-6, 7-6, 6-4 defeat by France's Virginie Razzano in the Japan Open final.
Rafael Nadal, the world's number two tennis player, won the second edition of the Capitala World Tennis Championship in Abh Dhabi on Saturday. The Spanish ace beat Robin Soderling of Sweden 7-6(3), 7-5 to carry away the prize of US $250,000 at the end of a two-hour battle.
Both won their semi-finals at the US open in straight sets, beating Nikolay Davydenko and David Ferrer respectively.
Roger Federer is poised to write more tennis history at the U.S. Open this weekend against semi-final opponent Nikolay Davydenko at the National Tennis Center.
Spain's depth of talent and growing appetite for Davis Cup success mean the only team that could have given them a real run for their money in this year's final would have been "Spain B".