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)

Roger Federer and Stanislas Wawrinka won their singles matches on Friday to give Switzerland a convincing 2-0 lead over Serbia in their World Group first-round tie. Returning to Davis Cup tennis, Federer cruised past Ilija Bozoljac, winning 6-4, 7-5, 6-2 in less than two hours. Australian Open champion Wawrinka faced a tougher task against 102-ranked Dusan Lajovic in the second match, before winning 6-4, 4-6, 6-1, 7-6 (7).

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