All the credit to Djokovic his groundstrokes were fantastic and his serve has come a long way, but Federer just did not seem as enagaged in the match as usual. On many returns Federer seemed to just lose concentration and miss serves that he usually hammers. Also, after the 2nd set he let Djokovic take control of the rallies again. He should have been aggressive and try to take it Djokovic after the double break set win. Instead it was the contrary and Djokovic took control of the match. I know Federer really wanted to win, but maybe his heart wasn't fully in the match? Kind of like him versus Canas in March.