i am not an expert but, i've been watching murray and jakovich for long. i think novak started tasting success when he understood the emotions of the game,his countymen who were hoping lots from him and also of his own on and off the field.. murryay despite leading in important matches couldnt control his emotions. many times he just give it up in the final sets. he is a good fighter but, i think he should learn to handle his emotions.
Murrey has improved a lot. He has become a threat to any opponent in the world now. His hard physical training must have helped him to improve his game. To me, he as a tennis player is of highest level but frankly speaking I don't like him much, and I don't know why, may be as because he represents England. Djokovic's main weapon is his physical fitness. His body seems to be made of steel and cane and flexibility is best in tennis world. His court craft, anticipation, speed variation, service - everything is unique. I like Roger most, next is Djokovic on any tennis court. I'm a staunch supporter of these two but same way I dislike Nadal - i can't reason why.