Arsenal are competing in the Premier League title race, and a big factor behind their good form has been their outstanding defensive work. William Saliba, Gabriel Magalhaes and Declan Rice have all been paramount to Arsenal’s incredible defence, which is now the best in the Premier League and one of the best in Europe. In Arsenal’s last three away games ahead of Sunday’s trip to face Manchester City at the Etihad, Arsenal have scored 17 times without reply, and they have hardly conceded any shots or big chances. Mikel Arteta’s side are snuffing attacks out before they can get anywhere near the…