[Opinion] The Opinion of Former Coach Serena Williams About Novak Djokovic: "Compared with Federer and Nadal, He Is a Mediocre Player"

French tennis coach Patrick Mouratoglou, a former technician of Serena Williams—among many other stars—said very harshly about Novak Djokovic in a recent interview in which he came to call him "mediocre" compared to his two contemporaries of Big Three, Rafa Nadal and Roger Federer. "When you look at Djokovic's tennis at the age of nineteen, at no time can you think he's going to become what he is today. And even today, if you're really an observ…