The Celtics didn’t plan for Joe Mazzulla — now he defines them

Joe Mazzulla wasn’t supposed to be the long-term answer.

A week before training camp in 2022, the Celtics’ future was clear and it was beautiful. They had just come off a Finals loss against the Warriors, the roster was intact, and the next few years of contention felt inevitable.

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Then, the Ime Udoka situation forced everything sideways, and a 34-year-old assistant coach was suddenly running a contender with championship expectations and no runway to grow into the job.

That kind of transition usually leaves a scratch on an organization when you look back at their history. Even good teams wobble when the voice in the room changes overnight. Boston didn’t. In Mazzulla’s first year, they opened 18–4, carried over the same edge from the previous season, and kept stacking wins as if nothing had really changed. At the time, that steadiness felt temporary, like the roster was strong enough to carry the rookie coach while things settled.

A few years later, it’s clear that wasn’t what was happening.

An emergency replacement

Early on, the question followed Mazzulla everywhere: how much of the success was him, and how much of this was already built? It’s a fair question when you inherit a Finals team with two All-NBA wings entering their prime. Plenty of coaches could keep that group competitive. Far fewer can shape it into something more sustained and defined.

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That’s where Mazzulla has separated himself. The Celtics play with a level of clarity that reflects a coach who knows exactly what he wants each game to look like. Offensively, the system is built on quick decisions and spacing that stretches defenses until something gives. The three-point volume gets a lot of the attention, but the real story is how those shots are created. The ball rarely sticks. Actions flow into each other. Role players are involved by design.

You see it in players like Payton Pritchard stepping into larger responsibilities, whether that’s as a starter or off the bench. You see it in how Jaylen Brown’s usage shifts depending on who’s available. The system holds up through the constant roster changes…

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Publish date : 2026-04-05 10:00:00

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