BOSTON — The Celtics went up big on the Knicks after a slow start, grabbing the 123-117 win Tuesday at TD Garden. The C’s improved to 12-9 with the victory while the Knicks dropped to 13-7.

It was all Knicks from tipoff as they hit 3-pointers early, leading by 14 points midway through the second quarter. But then the Celtics overwhelmed the Knicks. They finished the first half on a 33-13 run, flipping it to a six-point lead by the break. Jaylen Brown was excellent, scoring 18 points in the second quarter alone.

The Celtics maintained that advantage with another stellar offensive showing in the third quarter, outscoring the Knicks 36-24. While the Celtics’ lead ballooned to 18 points, the Knicks cut it down to a three-point game in the fourth quarter. New York was unable to grab the lea

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