Parma held AC Milan to a 1-1 draw at the Stadio Tardini, halting the Rossoneri in their tracks after they looked to have recovered from a poor start to the season.
Stephan El Shaarawy, who was Milan's hero in their midweek 2-0 win over Cagliari, put Massimiliano Allegri's side in front early in the second half but Daniele Galloppa equalised in the 66th minute to earn Roberto Donadoni's side a point, which leaves them just a point behind their visitors.
Both sides had chances to win it in a game which came to life in the second half after a drab opening 45 minutes.
Juventus opened up a three-point lead at the top after seeing off Roma 4-1 at the Juventus Stadium.
The victory was wrapped up within the opening 20 minutes with goals from Andrea Pirlo, Arturo Vidal and Alessandro Matri putting the Bianconeri in the driving seat.
Pablo Osvaldo pulled a goal back from the penalty spot for the Giallorossi, but Zdenek Zeman's men were unable to find a way back into the game and Sebastian Giovinco added a late fourth to leave Roma eight points behind the Bianconeri in the Serie A table.