C M Punk the second city saint just show in his trailer why he is best in the world. He is WWE champion for almost a year. He thinks that every person in the WWE disrespected him. Thats how he explains his actions towards attacking every person including John Cena. He thinks that no one is better than him or we can say that he is best in the world.
But since he is WWE champion, he somehow manage to defeat Chris Jericho, John Cena, Ryback but he didn't lose it.