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Cristiano Ronaldo scored for the eighth game in a row for Juventus on Sunday but could not prevent his side slipping to a 2-1 Serie A defeat to Napoli at the Stadio San Paolo.
The visitors saw more of the ball in the first half but did not manage a single effort on target. Their best chance was a wayward Ronaldo header just before half-time from a Paulo Dybala free-kick.
Napoli had the better chances, but both Arkadiusz Milik and Mario Rui sent efforts over the crossbar in an uneventful opening 45 minutes.