Serbia win Davis Cup final beating the Belgrade Arena . Czech retain the trophy they won Saturday . Radek Stepanek wins the deciding singles . Stepanek , who had paired with Berdych to win the crucial doubles for the reigning champions Saturday , was stunned in the very first game as he saw Lajovic break his service . Novak Djokovic had extended winning run to 6 to draw Serbia level .
Serbia win Davis Cup final beating the Belgrade Arena . Czech retain the trophy they won Saturday . Radek Stepanek wins the deciding singles . Novak Djokovic had extended winning run to 6 to draw Serbia level .