Romelu Lukaku scored from the penalty spot as Inter beat title rivals Napoli 1-0 on Wednesday to move one point behind Serie A leaders and city rivals Milan who were held at Genoa.

Defending champions Juventus sit three points behind Inter after Cristiano Ronaldo missed a penalty in a 1-1 home draw with Atalanta.

Napoli -- who played the final quarter of an hour a man down after captain Lorenzo Insigne was sent off -- drop to fourth, a further point adrift.

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