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Nis - Novak Djokovic's Serbia reached the Davis Cup quarter-finals on Saturday when Nenad Zimonjic and Viktor Troicki clinched victory in the doubles rubber of the World Group first-round tie against Russia.
The Serb pair downed Andrey Kuznetsov and Konstantin Kravchuk 6-3, 7-6 (7/3), 6-7 (5/7), 6-4 for an unassailable 3-0 lead in the tie.
Serbia, the 2010 champions, will meet either Spain or Croatia in April's quarter-finals.
On Friday, Troicki beat Karen Khachanov 6-4, 6-7 (3/7), 6-3, 1-6, 7-6 (8/6) in the opening singles before Djokovic made it 2-0 when Daniil Medvedev retired with cramps in the fourth set allowing the 12-time major winner to claim a 3-6, 6-4, 6-1, 1-0 win.
