The Official ball of the US Open. For more than 40 years, every point at the US Open has been scored with a Wilson US Open tennis ball. Unparalleled consistency and performance makes it the gold standard in tennis, trusted by the best in the game when it's all on the line. Crafted with premium woven felt for superior bounce characteristics, this ball is available in Extra Duty, Regular Duty and High Altitude variations to ensure optimal performance on your preferred playing surface.