As the Boston Celtics prepare to face the Philadelphia 76ers in their first-round playoff series, head coach Joe Mazzulla stresses the importance of not underestimating their opponents. The 76ers, who clinched the No. 7 seed in the Eastern Conference following a play-in victory over the Orlando Magic, have had a challenging season but have shown resilience. Mazzulla acknowledged the 76ers' ability to overcome adversity, stating, 'Philly is a great team' and that the Celtics must be ready for a tough matchup. The 76ers will likely be without their star center, Joel Embiid, who has been sidelined since April 6 due to an abdominal injury. Meanwhile, the Celtics are entering the playoffs with a fully fit Jayson Tatum, who has recovered from an Achilles injury. The Celtics are favored by 12.5 points in Game 1, which is scheduled for Sunday at 1 p.m. ET on ABC.