Game On! 🎉 Elevate your play with every serve! Designed for consistent performance and control. Bright yellow color for easy tracking. 24 packs of 3 for endless matches. Used in the prestigious US Open tournament. Engineered for extended play on hard courts. High Performance Extra Duty 24 Packs The Wilson US Open Extra Duty Tennis Balls come in a bulk pack of 24, each containing 3 high-performance balls, specifically designed for hard court play. These balls are the official choice for the US Open, ensuring professional quality and unmatched durability for avid players.