Underdog Promo Code FOXSPORTS: Play $10, Get $50 on Any NBA Opening Day Game Including Celtics vs. Pistons

This page may contain affiliate links to legal sports betting partners. If you sign up or place a wager, FOX Sports may be compensated. Read more aboutSports Betting on FOX Sports. The NBA is back, and opening day brings a tripleheader of matchups for basketball fans to enjoy. New users can use the Underdog promo code FOXSPORTS, play $10 and get $50 in bonus entries to celebrate the start of the 2026-27 season. The Boston Celtics and Detroit Pistons headline the opening matchup, with Jayson Tatum and Cade Cunningham among the stars to watch as both teams look to start the season strong. The action continues with the Philadelphia 76ers facing the New York Knicks before the Oklahoma City Thunder and San Antonio Spurs close out opening night. Get ready for a new season of NBA action with Underdog. New users can use promo code FOXSPORTS and play $10 to receive $50 in bonus entries. Whether you're following the Eastern Conference showdown in Detroit or the Western Conference clash in San Antonio, there's plenty of basketball to get excited about. How to Sign Up and Claim the Underdog Promo Code