Mar 1, 2024; Boston, Massachusetts, USA; Boston Celtics head coach Joe Mazzulla talks with guard Derrick White (9) from the sideline as they take on the Dallas Mavericks at TD Garden. Last summer was a whirlwind for the Boston Celtics. Accordingly, many fans and analysts were down on the Celtics, believing they’d struggle this season and fall off a cliff. The veteran guard received a hilarious birthday call from head coach Joe Mazzulla, which he finally revealed on the “Old Man and The Three” podcast this week. Despite missing his best player, he’s finding ways to win more often than not, proving why he’s one of the best coaches in the NBA.