Wilson US Open Extra Duty 18x4 balls

For the past 40+ years, every point at the US Open has been scored with a Wilson US Open tennis ball. Unparalleled consistency and performance make 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, this ball is available in Extra Duty, Regular Duty and High Altitude variations.
Approved by USTA & ITF for competitive play
Official Ball of the US Open
Made with premium woven felt
Extra Duty: Ideal performance on hard, abrasive courts
Regular Duty: Ideal performance on soft, clay/indoor surfaces
High Altitude: Ideal performance on surfaces above 3,000 ft.
Includes 18 cans each containing 4 balls