The Celtics swept their season series against the Knicks after earning a 119-117 victory in overtime at Madison Square Garden.
Kristaps Porzingis led the Cs in scoring with 34 points in the place he used to call home.
Jayson Tatum added 32 points as the Celtics clinched the second seed in the East.
Karl-Anthony Towns led the Knicks in scoring with 34 points.
He also grabbed a game-high 14 rebounds for a double-double.
New York is third in the conference.
The Celtics are in Orlando tonight.
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