"I'm in a good spot at this moment," the 26-year-old told reporters. "I enjoy tennis. I enjoy competing. I am definitely playing the best tennis this year.
"[The] summer was up and down, and now again I'm playing on a very high level and have lots of confidence in myself, in my game."
Djokovic has won six titles this year - including the Australian Open - but lost his spot at the top of the rankings to Rafael Nadal.