Roger Federer is considered a master in the game of tennis, but even he is not immune to the new talented faces coming in the game and steamrolling their senior competitors just like Serena Williams had faced in the US Open finals. Somehow the master has managed to dodge a bullet from the Italian Mateo Berrettini on Tuesday here at the ATP finals tournament. He had earlier faced defeat in his campaign against Dominic Thiem in the opening round....