Novak Djokovic has several signature characteristics and Courier noted defiance as one of the major ones.
Yes, Djokovic is indeed very defiant, he would not be as successful as he is if he weren't. His life path has been far rockier than some of the other players but it served him well over the years and it still does. Talking about the Serbian, Courier said:
"One of the things that makes him so special is the way he uses the energy around him, and not always the positive energy around him, to stoke his fire."
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"Defiance is a signature characteristic for him. Any time the fans get on him, he uses that as fuel for his fire and he's such a vicious competitor. He's tough to knock down on any level."