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Which Tennis Ball is in Use? It Makes a Difference - The New York Times
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SOLVED:The mass of a regulation tennis ball is 57 g (although it can vary slighaly), and tests have shown that the ball is in conthet with the tennis racket for 30 ms. (
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Tennis Ball Size & Information Guide | Net World Sports
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Amazon.com : Wilson Hyper Hammer 5.3 Oversized/Extended Tennis Racquet (4 1/4" Grip) Set or Kit Bundled with a Black/White Advantage 2-Pack Tennis Racket Bag and a Can of Tennis Balls : Sports
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Different Color Tennis Balls & Their Purpose - Basha Tennis