I believe that Federer will fall in 2010. Down the rankings. I think the game iscatching up to him, he is now vulnerable to players like Benneteau and Verdasco. Meanwhile Del Potro is now a force, Djokovic is coming back strongly and we all Nadal will vamos back next year after he is properly rested. I hate it but Murray will also be a factor. Plus players like Davydenko are suddenly playing better than before. Plus they might be a breakout player next year that we don't know yet.
Federer himslef. His game has gone down a bit, just enough for the younger generation to catapult over him. Federer has enough game to stay competitive in masters. He will focus on the Slams. He will go deep in a few. But I am confiendt he will fail to win one next year.
All this equals Federer falling down to 5 or 6 in the rankings at the conslusion of 2010. and then the question is, will he be ready to play as the 5 or 6 player for 2011.