The Wilson US Open Extra Duty Ball has been the official ball of the US Open since 1978. This ball has been made with premium texture and tech industry felt. Optimal performance and durability on hard courts, clay courts, and indoor courts. 

For more information on tennis balls, check out the following blogs:

Every Different Type of Tennis Ball

Finding the Right Tennis Ball Machine for Your Game

Note: Due to the size of this item it does not qualify for free 2nd Day Air shipping. Fee is $0.75 and will be Standard ground shipping.