I still see djokovic #1 at the end of the year because he's stronger than murray on clay and Federer has too much to defend to get close to him.
Murray will be 2nd due to the fact aside from his big wins, he doesnt have that many points to defend and can certainly improve on alot of them, especially IF he does well on clay.
Federer will be 3rd as he has ALOT of points to defend and i dont see him defending many of them in comparison to murray who can improve on most of his.
Nadal will retake his 4th from ferrer due to him being a beast on clay but he wont be catching the top 3 just yet.
Thats my opinion.
To be a tennis pro, you have to get good at handling players balls.