Inter Milan's dismal start to the season continued as they were beaten 2-1 at Catania to remain just above the bottom three in Serie A.
Just two weeks after going down 3-0 at home to Napoli, Claudio Ranieri's side lost again, despite taking a sixth-minute lead through Esteban Cambiasso.
Sergio Almiron and a Francesco Lodi penalty turned the game around in the second half, as the Sicilians took a deserved three points to leave the Nerazzurri five points behind them in the table after six games of the season.
AC Milan gave their season a much-needed lift with a convincing 3-0 victory at home to Palermo.
Antonio Nocerino fired the Rossoneri in front shortly before the interval, with Robinho and Antonio Cassano putting the result beyond doubt in the second half.
Napoli missed the chance to move top as they fell to a shock 2-1 defeat at home to Parma.
Massimo Gobbi put the visitors in front in the 57th minute, but Giuseppe Mascara equalised for the home team 15 minutes from time.
Napoli then pushed for a winner, ending the game with five forwards on the field, but it was Parma who found the goal that was worth three points with Francesco Modesto netting in the 82nd minute.
The win lifts Parma up to sixth in the table, with Napoli remaining a point behind league leaders Udinese and Juventus, and suffering a knock to their morale ahead of Tuesday's Champions League clash against Bayern Munich.