People here seem to think that Fedor wins because of some magical Russian sauce, that he's so good because of talent.
He's the best because he works the hardest. He has no distractions; he challenges himself more in training then any other fighter in the world. He has great coaches and a great team that constantly pushes him to be the best. His training camps are brutal and he has more hardships in training then he could ever have in the ring.
He wins on his hard work and his mind. He is the mentally strongest fighter in the world, and this shows both in the ring and out of it. He has no ego, knows himself and his opponents; till this changes, he will not lose.