MANOLO GABBIADINI came off the bench to score a dramatic late equaliser from the penalty spot for Napoli.
West Ham flop Mauro Zarate looked like he had sealed the win for Fiorentina when he fired in a beauty with less than ten minutes remaining.
Lorenzo Insigne had put Napoli ahead just before half-time with a screamer from 25 yards out before Federico Bernardeschi pulled one back in the 51st minute.
Dries Mertens continued his fine form with a goal in the 68th minute before Bernardeschi bagged his second just minutes later.
Zarate thought he had the final word when he latched on to a fabulous pass from his clinical teammate to fire past Pepe Reina before Gabbiadini sealed a point for Napoli with the final kick of the game.
Elsewhere, Roma closed the gap on Juventus with a routine 3-1 over Chievo.
Leaders Juve face AC Milan in the Italian Super Cup final on Friday but now have the capital club breathing down their neck thanks to goals from Stephan El Shaarawy, Edin Dzeko and Diego Perotti.
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