Rafael Leao scored the fastest goal in Serie A history to put Milan ahead at Sassuolo on Sunday, netting after just six seconds. 

The forward put an emphatic finishing touch to a Milan charge through the Sassuolo ranks, with Brahim Diaz playing the kick-off short to Hakan Calhanoglu, who raced straight towards the penalty area. 

Calhanoglu's pass through to Leao was smashed in, leaving the home side shell-shocked. 

Milan began the game at the top of Serie A.