BELGRADE, Serbia, Sept. 16 (UPI) -- David Nalbandian and Juan Martin del Potro each won Friday, putting Argentina up 2-0 over defending champion Serbia in the Davis Cup semifinals.
Nalbandian topped Viktor Troicki 6-4, 4-6, 6-2, 6-3 and del Potro defeated Janko Tipsarevic 7-5, 6-3, 6-4.