Although it took a while before the Partenopei could break their hosts up, it was worth the wait in the match, where Kvicha Kvaratskhelia converted a penalty before setting up two quickfire goals for Osimhen.
With this win, Napoli have consolidated their Scudetto credentials. They are 16 points clear of the top before the Milan derby.
The Partenopei went into the clash 13 points clear at the top and with an entire squad to choose from.
But that was not the case for their hosts, without nine players, including suspended Emanuel Gyasi, injured M’Bala Nzola, Simone Bastoni, Emil Holm, Albin Ekdal, Joao Moutinho, Szymon Zurkowski, Jeroen Zoet, Jacopo Sala and Viktor Kovalenko.
Apart from this, coach Luca Gotti wasn’t fit enough to sit on the bench after a hip surgery.
The visitors settled into the game quickly and began moving the ball slowly and predictably, with Spezia ready to sprint forward on the counter. Kevin Agudelo had a chance to punish Napoli, but his shot got charged down.
Mattia Caldara almost scored an own goal when trying to intercept Mario Rui’s cross to Osimhen, and Giovanni Di Lorenzo’s header flashed wide on the resulting corner.
After several attempts to score and no result, Matteo Politano replaced Chucky Lozano and immediately changed the game.
Napoli were awarded a penalty within seconds of the restart when Lozano tried to get on the end of a long ball. Arkadiusz Reca tried to hold the Mexican at the by-line, and the ball bounced to hit his outstretched arm.
The resulting penalty was converted by Kvarwskhelia, who blasted the ball into the top corner.
Napoli later doubled their lead when Kvaratskhelia’s cross was deflected straight into the air. Dragowski did not react quickly enough, leaving Osimhen to soar into the sky and nod into the empty net.
The Nigeria striker got his brace, capitalising on sluggish Caldara, who was on the edge of his penalty area. Kvaratskhelia generously rolled across for Osimhen’s tap-in from eight yards.