I ran out of my case of Dunlop Grand Prix and I didn't really want to spend that much money on a case of them again because althought they do last long, they are hard and hard on the arm. So I snagged up some Dunlop Championship Regular Duty and extra duty from KMart. Popped open a can last night and two out of the three balls had deformations in the felt. I came home and checked the cans of Championship that I had just purchased a few days ago and they all had balls with deformations in the felt. I then checked my some of my old Grand prix and Wilson US Open and I didn't see any deformations in them at all. Has anyone else had this experience with Dunlop Championship balls? Seems like it would mess up the bounce.