For more than 40 years, every point in the US Open has been made with a Wilson US Open tennis ball. Unmatched texture and performance make it the gold standard in tennis, trusted by the best in the game when everything is at stake. Made with first -class woven blanket for superior bouncing properties during the course of three sets, this ball is in the variants Extra Duty, Regular Duty and High Altitude to ensure optimal performance on your preferred playing surface.