BELGRADE - Novak Djokovic failed to lead Serbia to a Davis Cup triumph on Sunday, but a streak of 24 straight victories left him upbeat for next season in which he vows to focus on Grand Slam titles. The world number two swept the Czech Republic's Radek Stepanek and Tomas Berdych in straight sets, but his two points did not stop the Czechs from winning their second straight Davis Cup trophy, 3-2. Still, the wins number 23 and 24 lifted Djokovic's spirits after a season in which he won a single major -- the Australian Open -- and lost the top post in ATP rankings to Rafael Nadal. "It's an incredible number considering the fact that I lost three big matches in three months -- Roland Garros (semi-finals) , Wimbledon (final) and the US Open (final)," said Djokovic. –AFP