Can anybody answer these questions I have about tennis balls? 1) Do balls that are fuzzy bounce lower? 2) Are spin serves (and strokes) more effective and responsive on balls that have fuzzed up? 3) Do balls with very little felt on it bounce higher? What about spin? 4) Are balls supposed to fuzz up on grass courts? I've noticed that my Wimbledon balls become heavy and bounce low when I play on slightly damp synthetic grasscourt, so I was just wondering... For people who play regularly on synthetic grass courts, what are it's characteristics? There are 2 types around my area- normal synthetic grass courts and synthetic grass courts with sand. They are both very annoying to play on, and from my exp., the one with sand bounces low and slows down lots, the one without sand bounces low and skids like crazy. And please tell me anything else important I need to know about tennis balls/courts! Thanks!