AC Milan staked their claim as challengers for the Serie A title on Sunday after a statement 2-1 win over Napoli which put them top of the pile despite having to play over half-an-hour with 10 men. The American forward's matching-winning performance against a Napoli team weakened by injuries put Milan in first place on 12 points, ahead of both the champions and Roma -- 2-0 winners against Verona -- on goal difference. Napoli now turn their attentions to the visit of Sporting Lisbon in the Champions League after losing their perfect record in Italy's top flight. "A number of players were having difficulties as it was the first time this season we've played three games in a week and not everyone recovered fully," said Gasperini to DAZN. Milan loanee Francesco Camarda scored his first goal in Serie A at 17 years old when he headed home Lecce's stoppage-time leveller in a 2-2 draw with Bologna.