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Haaland reached his half-century in Europe's elite competition in just 49 appearances before Jeremy Doku ensured Pep Guardiola's men got their quest for UCL glory off to a winning start.
There was no fairytale return to the Etihad for Kevin De Bruyne as his night was cut short after just 26 minutes as a result of Di Lorenzo's dismissal. De Bruyne was welcomed back like a hero just months after departing as one of City's greatest players in the club's history.
The Belgian's name rang around the Etihad before kick-off, while a series of banners paid homage to the man who contributed nearly 300 goals or assists in 422 matches during his time in Manchester.
Napoli held firm until half-time thanks to some spectacular goalkeeping from Vanja Milinkovic-Savic.
Even when Milinkovic-Savic appeared beaten in first-half stoppage time, Matteo Politano got back on the line to block Tijjani Reijnders' goalbound effort.
