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Walter Mazzarri's preference for the back three and strong tactical ideas means that, for whatever club he's managing at the time, his sides always have a certain personality that's easily recognisable.
At Napoli, the coach's favoured way to play the game resulted in one of the most attractive sides in European football.
The Partenopei were difficult to break down, tactically astute, hard-working in attack and attentive in defence. It was a masterclass in using a back three with wingbacks—there were options going forward and cover when needed at the back. Inter are still some way off that standard.
Jonathan struggled with Alessio Cerci right from the off, and the Granata man could have had the opener after just four minutes were it not from the post. Defensive errors also lead to Samir Handanovic being in the position that ended in a penalty and a red card.
When Gian Piero Gasperini tried to install a three-man back line at the San Siro in 2011, it ended in a dressing room mutiny and a string of poor results that cost him his job. It's unlikely that Mazzarri will meet the same fate so soon in his tenure, having been so impressive in Naples, but if he doesn't sort out his defence soon, his astonishing record of never having been fired will come to an end before too long.