A truely challenging year....
Top 4 guys are very close one to each other. Hard to predict who will be on top. Right now Fed is hot but who knows.
2012 will be a truely challenging year for all of the top players with Fed regaining confidence and ability, Djoko looking to prove that 2011 was not a fluke, Murray hungry to get that GS title and Rafa looking to regain what he lost.
Each also have issues as Fed is getting older, Djoko is nursing back and shoulder problems, Murray has still got confidence problems and Rafa working through shoulder, foot and knee issues (more injections). With only 4 weeks rest (2 to be used for training), it doesn't give them much time to recover so good scheduling will become critical.
You also cannot overlook the threats from the other top players when you throw all of these issues in the pot, as they all are good players and very hungry to make their mark. Scheduling and the draw could make or break a GS title.
Cheers, TennezSport