NBA 2025-2026 season preview for Boston Celtics: Last season: 61-21, lost to New York in Eastern Conference semifinals. COACH: Joe Mazzulla (fourth season, 182-64). SEASON OPENER: Oct. 22 vs. Philadelphia. DEPARTURES: G Jrue Holiday, F/C Kristaps Porzingis, F/C Al Horford, C Luke Kornet. ADDITIONS: G Anfernee Simons, F Chris Boucher, C Luka Garza, G Hugo González, C Amari Williams BetMGM championship odds: 18-1. Boston Celtics: What to expect The Celtics aren’t a favorite to emerge from the East coming off a failed NBA title defense last season that ended with a conference semifinals loss to New York. It also included […]... Keep on reading: NBA: Boston Celtics face new season with a revamped roster