Mike Brown’s new offense sounded great on paper.

But inside the Knicks’ practice facility in Tarrytown during training camp, there was still quiet uncertainty about how his up-tempo, read-and-react system would mesh with a roster built around established stars and structured habits.

One game in, those doubts are fading fast. Brown’s West Coast offense and this roster of shooters and playmakers already look like a natural fit.

The Knicks opened their season with a 119–111 win over the Cleveland Cavaliers on Wednesday night at Madison Square Garden, and for the first time in years, their offense looked fluid — free-flowing, unselfish and unpredictable.

“It’s been great,” said Miles McBride, who scored 15 points on 4-of-7 shooting from downtown off the bench against the Cavs. “I feel

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