Stanislas Wawrinka, of Switzerland, returns a ball to Mikhail Kukushkin, of Kazakhstan, during the third single match of the tennis  Davis Cup World Group quarterfinal  between Switzerland and Kazakhstan,  in Geneva, Switzerland, Sunday, April 6, 2014. (AP Photo/Keystone,Salvatore Di Nolfi)

Switzerland Tennis Davis Cup

Stanislas Wawrinka, of Switzerland, returns a ball to Mikhail Kukushkin, of Kazakhstan, during the third single match of the tennis Davis Cup World Group quarterfinal between Switzerland and Kazakhstan, in Geneva, Switzerland, Sunday, April 6, 2014. (AP Photo/Keystone,Salvatore Di Nolfi)

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