AC Milan hammered runaway Serie A leaders Napoli 4-0 on Sunday in an incredible performance which slammed the brakes on their opponents' charge to a first league title in over three decades. Rafael Leao outshone Khvicha Kvaratskhelia in the battle of the wing wizards with a brilliant brace while Brahim Diaz and Alexis Saelemaekers netted the other goals for the rampant defending champions who move up to third. The biggest win of the Serie A season for Stefano Pioli's side was also a third league defeat for Napoli, whose huge lead at the top of the table has been cut to 16 points after second-placed Lazio beat Monza 2-0 earlier on Sunday.