Davis Cup World Group

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Switzerland's Michael Lammer, left, returns a ball as Marco Chiudinelli looks on during their Davis Cup World Group play-off first round doubles tennis match against Nenad Zimonjic and Filip Krajinovic of Serbia, in Novi Sad, Serbia, Saturday, Feb. 1, 2014. (AP Photo/Darko Vojinovic)

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Switzerland's Michael Lammer, foreground returns a ball as his partner Marco Chiudinelli looks on, during their Davis Cup World Group play-off first round doubles tennis match against Nenad Zimonjic and Filip Krajinovic of Serbia, in Novi Sad, Serbia, Saturday, Feb. 1, 2014. (AP Photo/Darko Vojinovic)

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Germany's Florian Mayer hits a forehand against Spain's Feliciano Lopez during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)

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Germany's Florian Mayer celebrates after beating Spain's Feliciano Lopez during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)

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Germany's Florian Mayer, left, celebrates with team captain Carsten Arriens after beating Spain's Feliciano Lopez during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)

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Spain's Feliciano Lopez hits a backhand against German Florian Mayer during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)

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Spain's Feliciano Lopez serves against German Florian Mayer during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)

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Germany's Philipp Kohlschreiber serves against Spain's Roberto Bautista Agut during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)

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Germany's Philipp Kohlschreiber hits the ball in celebration after beating Spain's Roberto Bautista Agut during a Davis Cup World Group first round tennis match between Germany and Spain in Frankfurt, Germany, Friday, Jan. 31, 2014. (AP Photo/Michael Probst)