Switzerland's Michael Lammer, top, 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)

Serbia Switzerland Davis Cup Tennis

Switzerland's Michael Lammer, top, 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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