On Sunday, at the beautiful Etihad Stadium, football fans will be able to enjoy the great match between Manchester City and Liverpool. The team led by Pep Guardiola is one point ahead of the Reds, who have come from behind in recent weeks; a comeback that could be worth the title.Jurgen Klopp presented the delicate challenge in a press conference and compared the rivalry between Liverpool and Manchester City with that between Roger Federer and Rafael Nadal. “Guardiola is the best coach in the world and we all agree on that.If someone doesn’t agree, I don’t understand how he does it,” Klopp said i …