DIGITAL VIDEO August 16, 2021 9:01 pm Smart's extension keeps heart and soul of Celtics in Boston With Marcus Smart and the Celtics agreeing to a four-year, $77 million contract extension, he’ll get the chance to continue to prove his value to the organization. Celtics Videos 1:08 Jayson Tatum: Attention to detail on defense was better in Game 3 1:09 Jaylen Brown: C's ‘excited' to embrace every step of the journey 0:50 Kristaps Porzingis talks ‘tough' two days before bouncing back in Game 2 0:56 Eddie House: Celtics ‘played like they were down 0-2' in Game 3 vs. Heat 1:00 Eddie House reacts to Herro's technical foul against Hauser: ‘We're not backing down'