Djokovic gives Serbia 2-0 lead over U.S.
Djokovic gives Serbia 2-0 lead over U.S.
Novak Djokovic struggled past Sam Querrey 6-2, 7-6 (4), 2-6, 6-3 for Serbia to take a 2-0 lead against the United States in their Davis Cup first-round tie on Friday.
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