Hall of Fame
I think in terms of skill level all 3 are reasonably matched with their own strengths and weaknesses. What separates Djokovic from the other 2 is that his mental strength is unparalleled. Have never seen him get nervous when close to the finish line and even today just refused to make any UEs towards the end. He might be prone to more lapses of concentration than Nadal in the middle of the match but when the finish line is close, he just never lets his grip get away.