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Italy's Serie A is the hotspot for three-man defensive systems.
Coaches such as Vincenzo Montella, Andrea Stramaccioni and Francesco Guidolin have all taken notes on Walter Mazzarri's impressive system at Napoli, constructing similar copies themselves.
Defensively speaking, Montella's Fiorentina are arguably the best exponents, and that was proven once again vs. Internazionale.
The back three's innate understanding and knowledge of when to expand and contract according to what's happening around them is astounding. They retained a spare man against the Nerazzurri's front two, forced Fredy Guarin into an ineffectual role and mopped up most second balls.
The one goal conceded was an unstoppable wonder strike from Antonio Cassano.