Wilson US Open Tennis Balls - Yellow

'Extra Duty' signifies that the felt on these balls is specifically engineered to be more durable and withstand the abrasive nature of hard court surfaces. This results in longer playability and consistent performance on such courts.

Yes, while primarily optimized for hard courts where their 'Extra Duty' feature shines, they also provide optimal performance and durability on clay and indoor court surfaces.

Absolutely. The Wilson US Open Tennis Balls are USTA (United States Tennis Association) and ITF (International Tennis Federation) approved, making them suitable for official tournaments and competitive matches.

Each can of Wilson US Open Tennis Balls contains 4 balls.

The high altitude core variant features a specialized core designed to maintain optimal bounce and performance on courts located at elevations above 3500 feet, where standard balls might react differently due to thinner air.

The lifespan of a tennis ball depends on factors like play intensity, court surface, and environmental conditions. However, their 'Extra Duty' construction ensures excellent durability, especially on hard courts, often outlasting standard tennis balls under similar conditions.

Tennis balls are stored in pressurized cans to maintain their internal pressure. Once the can is opened, the pressure inside the balls gradually equalizes with the atmospheric pressure, causing them to lose their bounce over time. This is a normal and unavoidable process for all pressurized tennis balls.

Once a pressurized can is opened, balls naturally begin to depressurize. This is normal. To maximize their playing life, use them within a few weeks for casual play or replace them frequently for competitive use. There is no way to restore lost pressure to a tennis ball.

Ensure you are using fresh, new balls from an unopened can. Check for any visible damage or excessive felt wear on the balls. Also, consider the court surface; while these balls perform well on various surfaces, their 'Extra Duty' design is optimized for hard courts. Using the appropriate 'high altitude core' variant is crucial for high-altitude environments.

While 'Extra Duty' felt is designed for durability, extremely abrasive court surfaces, heavy topspin, and aggressive playstyles can still accelerate wear. Ensure the balls are stored correctly when not in use. If consistently experiencing rapid wear, consider if the ball type matches your court and play intensity.