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In the absence of Novak Djokovic, defending champion Serbia lost both its matches Friday to trail Argentina 2-0 in the Davis Cup semifinals.
Argentina's David Nalbandian beat Viktor Troicki 6-4, 4-6, 6-2, 6-3, and Juan Martin del Potro topped Janko Tipsarevic 7-5, 6-3, 6-4.
