This year I think it's going to be a hard dispute between Nadal and Djokovic, but I think that in the finals Nadal will recover himself and win this title again. I'm cheering for Federer, but this year is going to be really difficult to him win any Grand Slam.
For the female dispute, I think Clijsters will have an easy win since Serena is not going to play another Grand Slam. I don't think Wozniacki have a chance against Kim unless she starts to play more offensive.