Fans had to wear masks and follow social distancing regulations, while they also had their temperature checked upon entering the stadium.
They had little to cheer in the first half with just one shot on target.
The intensity increased after the break and Napoli was further transformed when new signing Victor Osimhen was brought on in the 61st minute.
The forward was involved in the opener two minutes later when he pressured Parma’s Simone Iacoponi in the penalty area causing the defender to head Hirving Lozano’s cross straight at Mertens who drilled it into the bottom right corner.
Osimhen almost helped Napoli double its lead moments later when his flick found Insigne, who hit the post.
Insigne did score in the 77th minute and Osimhen was again involved. Parma goalkeeper Luigi Sepe got a hand to Lozano’s cross that was directed at the Nigeria forward but could only palm it straight at Insigne, who fired in the rebound from close range.
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