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Titles bring confidence, confidence brings consistency, consistency means you reach the latter stages of tournaments where, with confidence and consistency, you win titles.
Roger Federer spoke to reporters about Djokovic's successes this year:
"He has more confidence; that's clear. Sometimes before when it was windy or he didn't feel good, he was not fighting as much. But [his] winning streak shows that he's playing normally and that he's winning maybe easier than before. But he's the same player.
He had some tight matches that he could have lost. He didn't… I don't believe he's different from my point of view. He was always finishing his matches very well."
Not one to mince words either, current world No. 2 Rafael Nadal also weighed in on the subject:
"Right now, he's probably defending better, but I think it has a lot of things [to do] about confidence."
And world No. 4 Andy Murray puts it brilliantly:
"I think he's got the right mentality on the court. He's been very solid throughout the whole year. He's starting tournaments very well, and when he's played against the top guys, he's raised his level, which maybe in the past he hadn't done. He's found a way of winning against them, and now obviously he's got a lot of confidence."
Confidence. And you heard it straight from the horse's mouth. Well, three horses' mouths.