Roger Federer

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Roger Federer, of Switzerland, celebrates after beating Mikhail Kukushkin of Kazakhstan during the second 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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Roger Federer of Switzerland serves a ball to Mikhail Kukushkin of Kazakhstan during the second 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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Roger Federer of Switzerland returns a ball to Mikhail Kukushkin of Kazakhstan during the second 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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Roger Federer, left, of Switzerland, poses with Mikhail Kukushkin, right, of Kazakhstan, after the draw prior to the Davis Cup World Group quarterfinals between Switzerland and Kazakhstan, in Geneva, Switzerland, Wednesday, April 2, 2014. (AP Photo/Keystone, Salvatore Di Nolfi)

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Swiss Davis Cup Team captain Severin Luethi, 2nd right, poses with his players Henri Laaksonen, left, Roger Federer, 2nd left, Stanislas Wawrinka, center, and Michael Lammer, right, after the draw prior to the Davis Cup World Group quarterfinals between Switzerland and Kazakhstan, in Geneva, Switzerland, Wednesday, April 2, 2014. (AP Photo/Keystone, Salvatore Di Nolfi)