The Davis Cup

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German player Tobias Kamke returns the ball to French player Jo-Wilfried Tsonga during their singles match in the quarterfinals of the Davis Cup between France and Germany, in Nancy, eastern France, Sunday April 6, 2014.(AP Photo/Remy de la Mauviniere)

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French tennis player Jo-Wilfried Tsonga gets encouragement from teammates during his single match against German player Tobias Kamke, in the quarterfinals of the Davis Cup between France and Germany, in Nancy, eastern France, Sunday, April 6, 2014. (AP Photo/Remy de la Mauviniere)

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French tennis player Jo-Wilfried Tsonga, right, gets encouragements from French team coach Arnaud Clement, left, during his single match against German player Tobias Kamke, in the quarterfinals of the Davis Cup between France and Germany, in Nancy, eastern France, Sunday April 6, 2014.(AP Photo/Remy de la Mauviniere)

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Switzerland's Stanislas Wawrinka, right, speaks with his doubles partner Roger Federer, left, during their doubles match of the Davis Cup World Group Quarterfinal match between Switzerland and Kazakhstan in Geneva, Switzerland, Saturday, April 5, 2014. Roger Federer and Stanislas Wawrinka lost the doubles match to Andrey Golubev and Aleksandr Nedovyesov on Saturday, giving Kazakhstan a 2-1 lead over Switzerland in the Davis Cup quarterfinals. (AP Photo/Keystone,Salvatore Di Nolfi)

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Switzerland's Roger Federer, left, speaks with his doubles partner Stanislas Wawrinka, right, during their doubles match of the Davis Cup World Group Quarterfinal match between Switzerland and Kazakhstan in Geneva, Switzerland, Saturday, April 5, 2014. (AP Photo/Keystone,Salvatore Di Nolfi)