2013 is bound to be an easier year for Nole than 2012: he has fewer points to defend, he doesn't have the pressure of expectations (Murray will have that). So he'll play more freely.
His 2013 season will be better than his 2012 season, I think. Will it be as good as 2011? I'm not ruling that out.
I think he'll win at least 2 slams and end the year as #1 again.
PS I've done my make-up and my nails, and yes, Nole is the sexiest man alive.