$ 0 0 Wimbledon champion Novak Djokovic replaced Rafael Nadal at No. 1 in the ATP rankings Monday, while runner-up Roger Federer rose one spot to No. 3. "It means a lot at this stage of my career," said Djokovic, who was last in the top spot nine months ago. This is his 102nd week atop the men's rankings overall, the eighth most in history. In all, there were eight changes in the top 10 a day afterDjokovic beat Federer 6-7 (7), 6-4, 7-6 (4), 5-7, 6-4 for his second championship at the All England Club and seventh Grand Slam title. The 27-year-old Serb first reached No. 1 after earning the 2011 Wimbledon trophy.