A lot of talk toward the end of 2011 was about how Novak Djokovic would ever top his career best year.
How could anybody realistically do any better?
Even Roger Federer, in the pre-Rafael Nadal era never managed to win the calender Grand Slam, and some consider him to be the greatest of all time (although he does have a losing record to Nadal).
The tour is even tougher this year than last, with a fitter Juan Martin Del Potro, a re-energised Federer and Andy Murray playing with a reputable coach.
The chances of Djokovic repeating his success seems impossible, yet the opportunity for him is there.