Dries Mertens scored a penalty in the 82nd minute and Fernando Llorente added a late score as Napoli beat defending champions Liverpool 2-0 at Stadio Sao Paolo in their opening Champions League group game on Tuesday.

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Jose Callejon drew the foul for the Serie A side after being tripped by Liverpool defender Andy Robertson, allowing for Mertens to then successfully convert.

Liverpool goalkeeper Adrian, making his Champions League debut, correctly guessed on Mertens' attempt but couldn't keep the ball out of his net.

Llorente, who came on as a substitute in the 69th minute, pounced on a Liverpool mistake in the back line to slot past Adrian for Napoli's second on the night.