BOSTON — Boston Celtics president Brad Stevens has said throughout the offseason that that team wanted Joe Mazzulla to be its coach for a long time.It made that more than a proclamation Friday, announcing it has signed Mazzulla to a multi-year contract extension. Length and details of the new deal were not released.In a statement, Mazzulla called his new pact with the team “a blessing.”“I would not be here without my faith, my wife, and my children,” Mazzulla said. “We are thankful for the partnership with our ownership groups, Brad’s mentorship, and the support of our staff. Most importantly, I am grateful for the players I have been able to coach the past three seasons. I look forward to competing for the Celtics and the city of Boston.”Mazzulla, 37, is coming off his third season as Boston’s coach and has guided the team to the playoffs each season, including the franchise’s 18th NBA title to cap the 2023-24 season. He was the youngest head coach to win the NBA Finals since the 1968-69 season, when 35-year-old Bill Russell led the Celtics to the championship as a player-coach.Under Mazzulla, the Celtics have won …
