Monza earned a surprising but deserved 1-0 home win over Juventus – their first Serie A victory of the season – as the visitors struggled after being reduced to 10 men.
Angel Di Maria’s return from injury was cut short after being sent off five minutes before the break after placing his elbow in Armando Izzo’s chest.
Juventus had half-chances in the first half but newly-promoted Monza smelled blood in the second half and pressured the opposition defence to make mistakes, while Massimiliano Allegri’s side tried to look for possibilities of a counter-attack.
Substitute Christian Gytkjaer became the hero when he slid in the winner from Patrick Ciurria’s cross in the 74th minute.
Roma coach Jose Mourinho will miss the match against his former club Inter after being sent off in a 1-0 defeat to Atalanta.
Mourinho was shown a red card in the 57th minute after going onto the field to remonstrate with referee Daniele Chiffi, who had awarded a free-kick to Atalanta rather than what Mourinho thought should have been a penalty for his side.
Mourinho became even more infuriated and had to be held back by a member of his staff.
Teenage defender Giorgio Scalvini scored the only goal of the match at the Stadio Olimpico, firing into the bottom right corner in the 35th minute.
Udinese continued their strong start to the season as they recorded their fifth straight win, beating Inter Milan 3-1.
Nicolo Barella curled in a fantastic free-kick in the fifth minute to get Inter off to the perfect start but Udinese leveled when Roberto Pereyra’s free-kick went in off Milan Skriniar.
Udinese hit the post before Jaka Bijol headed in a corner with three minutes remaining and Tolgay Arslan made sure of the points in stoppage time with a diving header.
A brilliant header by Napoli striker Giovanni Simeone helped his side to seal a 2-1 win at AC Milan and return to the top of the Serie A table.
Simeone headed home in the 78th minute almost from the edge of the six-yard box following a superb Mario Rui cross.
Winger Matteo Politano had scored a penalty in the 55th minute following a foul by Sergino Dest on Khvicha Kvaratskhelia.
Olivier Giroud fired in an equaliser in the 69th minute from Theo Hernandez’s cross.