The Boston Celtics began their playoff campaign with a decisive 123-91 victory over the Philadelphia 76ers in Game 1 of the Eastern Conference First Round on April 19, 2026, at TD Garden in Boston, Massachusetts. The Celtics established an early lead and maintained it throughout the game, never allowing the 76ers to take control. Despite both teams ending with a tied shot margin of 90-90, Boston's shooting efficiency was superior, hitting 50% of their shots while holding Philadelphia to just 39%. The Celtics' defense was particularly effective, limiting the 76ers to a mere 17% from beyond the arc. Boston also excelled in ball movement with 31 assists compared to Philadelphia's 20. The Celtics' ability to force 15 turnovers while committing only 10 showcased their dominance on both ends of the court, setting a strong tone for the series.