Kei proved that small guy can push around and beat up big guys. He beat Berdych and Raonic to win Japan open. prototypical Big men in modern game who is supposed to dominate talented small guys like Kei was beaten and actually outpowered from the baseline. Kei proved Small men can still win Big tournaments over prototypical big men of modern game of tennis. So are the experts wrong in saying that you have to be 6'4" and must have 130 mph serves and big time power as well as speed to win big tournaments and majors ?