Switzerland's Roger Federer celebrates after winning his match over Ilija Bozoljac of Serbia during their Davis Cup World Group play-off first round tennis match between Serbia and Switzerland, in Novi Sad, Serbia, Friday, Jan. 31, 2014.  (AP Photo/Darko Vojinovic)

Serbia Switzerland Davis Cup Tennis

Switzerland's Roger Federer celebrates after winning his match over Ilija Bozoljac of Serbia during their Davis Cup World Group play-off first round tennis match between Serbia and Switzerland, in Novi Sad, Serbia, Friday, Jan. 31, 2014. (AP Photo/Darko Vojinovic)

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