I have an interesting problem, and wonder if anyone has a suggestion. I've got a 17 year old son who plays a couple of USTA tournaments per month, and is one of the better juniors in the state. I'm still a solid 4.5, but age and various injuries over the years are catching up. Unfortunately I am his only practice partner, so am on the court every day with him. I've got a really bad wrist, and have found that I just about can't play with the premium slow heavy balls. This includes the Wilson US Open ball, the Penn ATP ball, and anything made by Dunlop. I've always practiced with the readily available $2.00 per can Wilson Championship Heavy Duty, or the same model by Penn. All my son's tournaments use the premium slow heavy US Open or Penn ATP ball. He plays much better with it, and seems to struggle keeping balls in play with the much lighter, faster Championship Heavy Duty ball. I've tried to practice with him some with the US Open ball, or ATP ball, but my wrist can't handle it two days in a row. I feel like I am hitting rocks filled with water. I'm looking for a creative alternative. I'm considering opening new cans of the Championship Heavy Duty, and let them sit unused for a week to let them go a little dead to play closer to the slower premium balls. Any other ideas? Anyone using a ball that plays slower than these models, but not as heavy and tough on achy joints as the US Open, ATP, or the Dunlop balls?