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It's easy to forget that when Walter Mazzarri took over Napoli midseason in 2009, the Partenopei had only been back in Serie A for two years. In that context, his work on the bench in Naples has been exemplary. Not only have they challenged consistently, they've shaken up the usual Italian hierarchy that dictates Serie A should be controlled by the peninsula's northern clubs.
Napoli have become popular with neutrals the world over thanks not only to excellent players like Edinson Cavani, but also to Mazzarri's tactics. By way of an example, his mercurial Uruguayan forward scored 34 goals in 109 league games at his previous club, Palermo.
In Naples, it's 72 in 100.
Mazzarri's attacking, confident style has naturally led to him being linked with several clubs, including rivals Roma and even the EPL's Manchester City (according to TuttoSport h/t TribalFootball). Should he leave, club owner Aurelio De Laurentiis will have a job finding anyone better.
Watford manager Gianfranco Zola, who won a Scudetto with Diego Maradona in 1989 while at Napoli, might be an outside bet to replace him.