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they improved them a lot! if your question would be more specific, it would be easier to answer. the tennis balls used to be wads of hair or wool wrapped in stuff, but now they are more rubbery for bounce. i don't know exactly how.
First answer by ID3406705966. Last edit by ID414492885. Question popularity: 63 [recommend question]
Answers.com > Wiki Answers > Categories > Sports > Tennis > What did they change in tennis balls?
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Yellow tennis balls? How the tennis has change? Who invented tennis balls? Are tennis balls hand made? Why are tennis balls round? How tennis change over the years? How has tennis change over the years? Have tennis balls changed over the years? How have tennis balls changed over the years? Why are tennis balls created for different elevations? Are the tennis balls any different compared to years ago?
