One bad point and a player unravels. One slight hiccup and a player can completely lose his confidence and ultimately his game goes to hell. In the case of Djokovic, noticed he's played many bad points or missed many easy shots or gotten broken at times which for most other players would cause a meltdown. Instead, he fights harder! The only guy I saw fight as hard was Nadal. I guess there's a reason why Djokovic is becoming so hard to beat. Not because he's more talented than the rest but because he'll fight for the point and not given an inch and will force you to hit something spectacular to earn it. No freebies from him. Even when he goes into a mini slump or goes 2 sets down or goes 2 sets to 1 down, he fights even harder and forces you to play just as hard in order to keep the lead. Very hard to do even for somebody like Nadal who has been widely considered as one of the biggest fighters in the sport who plays every point like a match point. That's all I wanted to point out.