Argentina's Carlos Berlocq (R) celebrates with teammates, team captain Martin Jaite (C back to camera) and vice-captain Mariano Zabaleta (L) after he defeated France's Gilles Simon during their Davis Cup quarter-final tennis match in Buenos Aires April 7, 2013. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SPORT TENNIS)

France's Richard Gasquet looks on next to Argentina's deputy captain Mariano Zabaleta (L) during the official draw of their upcoming Davis Cup tennis match in Buenos Aires April 4, 2013. Gasquet was replaced by Gilles Simon for their match against Argentina in this weekend's Davis Cup quarter-final tie, the French tennis federation said on Thursday. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Argentina's Davis Cup team tennis players (L-R): Horacio Zeballos, David Nalbandian, Juan Monaco, assistant team captain Mariano Zabaleta, team captain Martin Jaite and Carlos Berlocq celebrate after defeating Germany in their series match in Buenos Aires February 2, 2013. Argentina won the series 3-0. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Players of Argentina's Davis Cup team (L-R) Horacio Zeballos, David Nalbandian, Juan Monaco, team captain Martin Jaite, assistant team captain Mariano Zabaleta and Carlos Berlocq celebrate after defeating Germany in their series match in Buenos Aires February 2, 2013. Argentina won the series 3-0. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Juan Martin Del Potro of Argentina plays a shot while team co-captain Mariano Zabaleta (L. back) and his coach Franco Davin watch during a training session ahead of their Davis Cup semifinals against Czech Republic in Buenos Aires, September 12, 2012. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Argentina's Juan Monaco plays a shot while assistant team captain Mariano Zabaleta (back) watches during a training session ahead of their Davis Cup World Group quarterfinal tennis match against Croatia in Buenos Aires, April 4, 2012. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Argentina's Davis Cup team captain Martin Jaite (L) talks to his assistant Mariano Zabaleta during a training session ahead of their Davis Cup World Group quarterfinal tennis match against Croatia in Buenos Aires, April 4, 2012. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Martin Jaite, Argentina's newly appointed Davis Cup team captain, stands next to his assistant Mariano Zabaleta before a news conference in Buenos Aires, December 22, 2011. Argentina have named former tennis player Jaite as their new Davis Cup captain, replacing Modesto Vazquez. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Martin Jaite (R), Argentina's newly appointed Davis Cup team captain, and his assistant Mariano Zabaleta pose after a news conference in Buenos Aires, December 20, 2011. Argentina have named former tennis player Jaite as their new Davis Cup captain, replacing Modesto Vazquez. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

Martin Jaite, Argentina's newly appointed Davis Cup team captain, speaks while his assistant Mariano Zabaleta (L) watches, during a news conference in Buenos Aires, December 20, 2011. Argentina have named former tennis player Jaite as their new Davis Cup captain, replacing Modesto Vazquez. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)

(L-R on right) Representatives of Aralar, partners in pro Basque independence coalition Amaiur, Jon Inaritu, Patxi Zabaleta, Dani Maeztu and Rebeca Ubera meet with (L-R) Borja Semper, Antonio Basagoiti, Inaki Oyazabal and Juana Bengoetxea of the Basque Partido Popular in San Sebastian November 29, 2011. People's Party (Partido Popular) leader and Spain's next Prime Minister Mariano Rajoy has said that he does not intend to include Amaiur in a round of meetings with opposition parties unless they condemn the actions of armed Basque separatists ETA. REUTERS/Vincent West (SPAIN - Tags: POLITICS)

Mariano Zabaleta of Argentina gestures during their Master Tennis Burgos match against Tommy Robredo of Spain in Burgos, northern Spain July 28, 2009 REUTERS/Ricardo Ordonez (SPAIN SPORT TENNIS)

Tommy Robredo of Spain jumps during their Master Tennis Burgos match against Mariano Zabaleta of Argentina in Burgos, northern Spain July 28, 2009 REUTERS/Ricardo Ordonez (SPAIN SPORT TENNIS)

Mariano Zabaleta of Argentina serves to Fernando Verdasco of Spain during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009 REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Mariano Zabaleta of Argentina serves to Fernando Verdasco of Spain during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009 REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain hits a return to Mariano Zabaleta of Argentina during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Mariano Zabaleta of Argentina hits a return to Fernando Verdasco of Spain during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009 REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain hits a return to Mariano Zabaleta of Argentina during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain hits a return to Mariano Zabaleta of Argentina during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain hits a return to Mariano Zabaleta of Argentina during their Master Tennis Burgos match in Burgos, northern Spain, July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain adjusts his cup during their Master Tennis Burgos match against Mariano Zabaleta of Argentina in Burgos, northern Spain, July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain serves to Mariano Zabaleta of Argentina during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Fernando Verdasco of Spain serves to Mariano Zabaleta of Argentina during their Master Tennis Burgos match in Burgos, northern Spain July 27, 2009. REUTERS/Felix Ordonez (SPAIN SPORT TENNIS)

Albert Montanes of Spain returns a ball to Mariano Zabaleta of Argentina during second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews (POLAND)

Albert Montanes of Spain returns a ball to Mariano Zabaleta of Argentina during second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews (POLAND)

Albert Montanes of Spain returns a ball to Mariano Zabaleta of Argentina during the second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews (POLAND)

Mariano Zabaleta of Argentina celebrates after scoring a point against Albert Montanes of Spain during the second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews (POLAND)

Mariano Zabaleta of Argentina returns a ball to Albert Montanes of Spain during second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews (POLAND)

Mariano Zabaleta of Argentina returns a ball to Albert Montanes of Spain during the second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews (POLAND)

Mariano Zabaleta of Argentina serves a ball to Albert Montanes of Spain during the second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews

Mariano Zabaleta of Argentina serves a ball to Albert Montanes of Spain during the second round match at the Orange Prokom Open ATP tennis tournament in Sopot August 2, 2007. REUTERS/Peter Andrews

QUALITY REPEAT
Ivo Karlovic of Croatia holds up the winner's trophy after defeating Mariano Zabaleta of Argentina in the final tennis match of the U.S. Men's Clay Court Championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

QUALITY REPEAT
Ivo Karlovic of Croatia hits a shot to Mariano Zabaleta of Argentina during the final tennis match of the U.S. Men's Clay Court Championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Mariano Zabaleta of Argentina hits a shot during the final tennis match of the U.S. Men's Clay Court Championships against Ivo Karlovic of Croatia in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

QUALITY REPEAT
Mariano Zabaleta of Argentina returns a shot to Ivo Kaelovic of Croatia during the final tennis match of the U.S. Men's Clay Court Championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

QUALITY REPEAT
Ivo Karlovic of Croatia acknowledges the crowd after defeating Mariano Zabaleta of Argentina in the final match of the U.S. men's clay court tennis championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Ivo Karlovic of Croatia celebrates after defeating Mariano Zabaleta of Argentina in the final tennis match of the U.S. Men's Clay Court Championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Ivo Karlovic of Croatia plays a shot to Mariano Zabaleta of Argentina during the final tennis match of the U.S. Men's Clay Court Championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Ivo Karlovic of Croatia stretches to return the ball to Mariano Zabaleta of Argentina during the final tennis match of the U.S. Men's Clay Court Championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Mariano Zabaleta of Argentina returns a backhand to Ivo Kaelovic of Croatia during the final match of the U.S. men's clay court tennis championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Ivo Karlovic of Croatia acknowledges the crowd after defeating Mariano Zabaleta of Argentina in the final match of the U.S. men's clay court tennis championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Ivo Karlovic of Croatia returns the ball to Mariano Zabaleta of Argentina in the final match of the U.S. men's clay court tennis championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Ivo Karlovic of Croatia holds up the trophy after defeating Mariano Zabaleta of Argentina in the final match of the U.S. men's clay court tennis championships in Houston April 15, 2007. REUTERS/Tim Johnson (UNITED STATES)

Mariano Zabaleta of Argentina plays a forehand shot during his semifinal match against James Blake of the U.S. at the U.S. Mens Clay Court Championships tennis tournament in Houston April 14, 2007. REUTERS/Tim Johnson (UNITED STATES)

Mariano Zabaleta from Argentina celebrates after winning the first set of his semifinal match against James Blake of the U.S. at the U.S. Mens Clay Court Championships tennis tournament in Houston, Texas April 14, 2007. REUTERS/Tim Johnson (UNITED STATES)

Mariano Zabaleta from Argentina returns a backhand shot to James Blake of the U.S. during their semifinal match at the U.S. Mens Clay Court Championships tennis tournament in Houston, Texas April 14, 2007. REUTERS/Tim Johnson (UNITED STATES)

Mariano Zabaleta from Argentina gestures to the crowd after defeating James Blake of the U.S. during their semifinal match at the U.S. Mens Clay Court Championships in Houston, Texas April 14, 2007. REUTERS/Tim Johnson (UNITED STATES)

Germany's Rainer Schuettler returns to Argentina's Mariano Zabaleta during a first round match at the ATP Generali Open tennis tournament in Kitzbuehel, July 25, 2006. REUTERS/Dominic Ebenbichler (AUSTRIA)

Argentina's Mariano Zabaleta celebrates after winning a point during a first round match at the ATP Generali Open tennis tournament in Kitzbuehel, July 25, 2006. REUTERS/Dominic Ebenbichler (AUSTRIA)

Argentina's Mariano Zabaleta serves to Germany's Rainer Schuettler during a first round match at the ATP Generali Open tennis tournament in Kitzbuehel, July 25, 2006. REUTERS/Dominic Ebenbichler (AUSTRIA)

Taiwan's Wang Yeu-Tzuoo hits a return against Argentina's Mariano Zabaleta during their match at the Australian Open tennis tournament in Melbourne January 16, 2006. REUTERS/Darren Whiteside

Thomas Johansson of Sweden hits a return to Mariano Zabaltea of Argentina at the US Open tennis tournament in New York. Thomas Johansson of Sweden hits a return to Mariano Zabaleta of Argentina during their match at the U.S. Open tennis tournament in Flushing Meadows, New York, August 29, 2005. Johansson defeated Zabaleta 6-3 6-4 6-3. REUTERS/Ray Stubblebine

Thomas Johansson of Sweden hits a return to Mariano Zabaltea of Argentina at the US Open tennis tournament in New York. Thomas Johansson of Sweden hits a return to Mariano Zabaleta of Argentina during their match at the U.S. Open tennis tournament in Flushing Meadows, New York, August 29, 2005. Johansson defeated Zabaleta 6-3 6-4 6-3. REUTERS/Ray Stubblebine

Zabaleta of Argentina reacts after a missed point to Johansson of Sweden at the US Open tennis tournament in New York. Mariano Zabaleta of Argentina reacts after a missed point to Thomas Johansson of Sweden at the U.S. Open tennis tournament in Flushing Meadows, New York August 29, 2005. Johansson defeated Zabaleta 6-3 6-4 6-3. REUTERS/Ray Stubblebine

Argentina's Zabaleta reacts after losing point during match against compatriot Gaudio at ATP Grand Prix tennis tournament in Kitzbuehel. Argentina's Mariano Zabaleta reacts after losing a point during a semi-final match against compatriot Gaston Gaudio at the ATP Grand Prix tennis tournament in Kitzbuehel, Austria July 30, 2005. Gaudio won 6-1 6-1. REUTERS/Dominic Ebenbichler

Argentina's Zabaleta returns ball during match against compatriot Gaudio at ATP Grand Prix tennis tournament in Kitzbuehel. Argentina's Mariano Zabaleta returns the ball during a semi-final match against compatriot Gaston Gaudio at the ATP Grand Prix tennis tournament in Kitzbuehel, Austria July 30, 2005. REUTERS/Dominic Ebenbichler

Argentina's Gaudio returns ball during match against compatriot Zabaleta at ATP Grand Prix tennis tournament in Kitzbuehel. Argentina's Gaston Gaudio returns the ball during a semi-final match against compatriot Mariano Zabaleta at the ATP Grand Prix tennis tournament in Kitzbuehel, Austria July 30, 2005. REUTERS/Dominic Ebenbichler

Argentina's Gaudio serves during quarter-final match against compatriot Zabaleta at ATP Grand Prix tennis tournament in Kitzbuehel. Argentina's Gaston Gaudio serves during a semi final match against compatriot Mariano Zabaleta at the ATP Grand Prix tennis tournament in Kitzbuehel, Austria July 30, 2005. REUTERS/Dominic Ebenbichler

Argentina's Gaudio reacts after winning match against compatriot Zabaleta at ATP Grand Prix tennis tournament in Kitzbuehelgainst. Argentina's Gaston Gaudio reacts after winning a semi-final match against compatriot Mariano Zabaleta at the ATP Grand Prix tennis tournament in Kitzbuehel, Austria, July 30, 2005. Gaudio won 6-1 6-1. REUTERS/Dominic Ebenbichler

Russia's Davydenko returns the ball to Argentine Zabaleta during Grand Prix tennis tournament in Kitzbuehel. Russia's Nikolay Davydenko returns the ball to Argentine Mariano Zabaleta during a second round match at the ATP Grand Prix tennis tournament in Kitzbuehel, Austria July 27, 2005. Zabaleta won 6-4 7-6. REUTERS/Dominic Ebenbichler