Stanislas Wawrinka of Switzerland returns a ball to Andrey Golubev of Kazakhstan during the first single match of the Davis Cup World Group quarterfinal match between Switzerland and Kazakhstan, in Geneva, Switzerland, Friday, April 4, 2014. (AP Photo/Keystone, Salvatore Di Nolfi)

Switzerland Tennis Davis Cup

Stanislas Wawrinka of Switzerland returns a ball to Andrey Golubev of Kazakhstan during the first single match of the Davis Cup World Group quarterfinal match between Switzerland and Kazakhstan, in Geneva, Switzerland, Friday, April 4, 2014. (AP Photo/Keystone, Salvatore Di Nolfi)

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