Wilson US Open Tennis Balls

While these are specifically engineered with Extra Duty felt for hard court durability, they will perform on other surfaces. However, the felt is thicker and designed to resist abrasion on rougher courts, so they may feel slightly heavier or slower on clay or grass compared to balls designed for those surfaces.

Extra Duty refers to the specific type of felt used on the ball's exterior. It is woven more densely to withstand the high-friction, abrasive nature of hard court surfaces, ensuring the ball maintains its flight characteristics and doesn't 'fuzz up' too quickly during play.

As pressurized balls, they are designed to maintain their bounce and internal pressure until the seal is broken. Once you open a can, the balls will begin to lose pressure naturally, so it is best to use them within a few days of opening for optimal performance.

Yes, these are the official ball of the US Open. They meet the rigorous ITF standards required for professional play, meaning you are getting the same consistency, weight, and bounce characteristics used by the pros on tour.

The case contains 24 individual cans, with each can holding 3 tennis balls. This configuration is ideal for clubs, coaches, or frequent players who want to ensure they always have a fresh supply of pressurized balls on hand.