People very often claim that even though Djokovic achieved better numbers in 2015 than he did in 2011, his level in 2011 was “significantly” higher.
But I have a feeling that Djokovic was simply trying to conserve energy in 2015 by refraining from going completely all out in matches unless absolutely necessary.
In 2011, he was smacking shots like his life depended on it and was playing relentless ferocious tennis, but it was clearly unsustainable and cost him the last 3 months of the season. After the US Open, he performed very poorly (for his standards) — he accumulated 5/6 of his losses for the season, did not even make the semi-finals of the ATP Finals and got BAGELLED by Nishikori!!
A phenomenal start to a season (perhaps the best start ever) followed by an insipid finish.
I think that in 2015, he learned his lesson from 4 years ago and decided to avoid overexerting himself, so that he could play at a more sustainable level that could last longer throughout the season. I don’t believe that it would have been impossible for him to re-awaken his 2011 beast-mode. I meant, come on, he was only 28 years old in 2015 and was still well in is physical prime. But I think that he wanted to take better care of his body - after all, this is the same man who was willing to sacrifice his career just to stand by his principles about his body.
But what do you guys think? Would you agree? Or not?