Isaac Okoro caught the ball right behind the 3-point line, drove past Jaylen Brown, and dashed into the paint where a sliding Luke Kornet met him.
Kornet gathered his feet, jumped straight up, and swatted the shot away with one hand. He tapped the ball back to Brown, who sprinted down the floor for a layup in transition.
Brown’s basket broke a 23-23 tie in the first quarter and ignited a 15-6 run that set the tone for the Celtics’ 120-95 victory over Cleveland in Game 1 of their second-round series at TD Garden Tuesday night.