Since 1978, the Wilson U.S. Open Tennis Ball - 4 Count has been the official ball of the U.S. Open. Now, you can stock up on these durable balls that are perfect for use on clay and indoor courts.
- Made with premium tex/tech industries felt
- Extra duty for optimal performance and durability on hard courts
- Regular duty for optimal performance and durability on clay/indoor courts
- High altitude core for best performance on courts above 3000'
- USTA and ITF Approved
- Vendor Style Number: WRT1062P0