Since 1999-00, Isaiah Thomas has dropped the most points for the Celtics in a game, with 52 points versus the Heat on December 30, 2016.

most points by celtics between 1999-00 to 2019-20 by a player in a game
Interpreted as:
most points by celtics between 1999-00 to 2019-20 by a player in a regular-season game

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