This is the official ball of the toughest tournament in the world, since 1978, the US Open. Why? Because it consistently delivers the optimum in response, durability and response, so you can hit it hard and always rely on it to play true. Utilising serious amounts of technology the US Open ball features an extra duty felt for longer wear on all surfaces. This pressured ball is ideal for competitive matches as it combines durability with response so you get a consistent bounce, making sure it"s the players who make the difference between winning and losing, not the ball.