Lorenzo Insigne scored the winner as Napoli beat RB Salzburg 3-2 in an enthralling contest.
Napoli took the lead through Dries Mertens' 17th minute goal, but a penalty from Erling Haaland pulled Salzburg level.
Mertens scored again in the 64th minute but Haaland then made it 2-2 before Insigne's goal ensured victory for Napoli.