Boston Celtics forward Jayson Tatum tore his right Achilles tendon in Game 4 of the Eastern Conference semifinals against the New York Knicks on Monday at Madison Square Garden. The Celtics, who are down 3-1 to the Knicks, announced on Tuesday that Tatum has already undergone surgery on his Achilles.

The Boston Celtics let the New York Knicks run away with a critical Game 4 victory in Madison Square Garden late last night, putting their own title defense in