AC Milan salvage a point at Sampdoria
AC Milan's run of draws was extended to four as they came from behind to claim a point against Sampdoria.
Emiliano Bonazzoli put the home side ahead after 68 minutes but, just like in Milan against Inter last month, Samp were unable to hold onto their advantage and succumbed to some intense late pressure.
Substitute Kakha Kaladze earned Carlo Ancelotti's side a 1-1 draw five minutes from time in Genoa.
In Siena, three men were sent off as the hosts scored twice in injury time to complete a dramatic late comeback and see off high-flying Messina 3-1.
The points looked set to be shared with the game entering its final seconds after Abdoulay Konko equalised Cristian Rigano's 20th-minute penalty opener.
And it seemed inconceivable that there could be any further action after Siena's Vincent Candela joined Messina duo Carmine Coppola and Nicolas Cordova in the dressing room for seeing red two minutes from time.
But, with Siena's 10 men seemingly drawing a blank against the visitors' nine, substitutes Mario Frick and Francesco Cozza popped up in injury time to give the game a thrilling late twist.