Has Wilson officially announced a difference in ball construction now that the US Open balls come in a new can? The old cans are the smoked ones. Regarding the balls, in my experience, the old balls used to go dead after a set. The new balls are a lot better and can even be used in a ball basket or ball machine because it keeps the pressure a lot better and plus the ball seems to stay consistently playable even after it has been used for some time. Thank you for any replies.