Romelu Lukaku struck again but Roma was held to a 1-1 draw at Torino and only has one win in five league matches.
Lukaku's goal - following a good team move in the 68th minute - was his third in four matches since his move from Chelsea. The Belgium forward was on loan at Inter last season.
Duván Zapata leveled for Torino with five minutes remaining when he headed in a free kick. Zapata almost joined Roma in the offseason from Atalanta.
Elsewhere, Rudi Garcia's job could be at risk only a few months into his tenure as Napoli coach.
Garcia took over in June after the resignation of Luciano Spalletti, who had just ended Napoli's 33-year wait for the Serie A title.
But Napoli is now winless in its past three league matches.
Victor Osimhen should have given Napoli the lead with 18 minutes remaining but he fired a penalty wide of the right post. The spot kick had been awarded after Bologna midfielder Riccardo Calafiori knocked the ball away with his wrist as he stumbled.
Osimhen had also hit the post early on.
Garcia was jeered by Napoli fans when he substituted Khvicha Kvaratskhelia and later Osimhen. There were also loud jeers at the end of the match.
Claudio Ranieri's Cagliari is still looking for its first win back in Serie A after it lost 2-0 at Atalanta.
Goals from Ademola Lookman and Mario Pašali? secured Atalanta its third win of the season.
