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I found this tennis ball and it was rattling, cut it open and found these rolled up metal cap looking things. : r/whatisthisthing
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USTA says decisions on tennis balls used for US Open made in consultation with tours, player councils
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Why the tennis balls at the US Open are different for women and men, as Iga Swiatek calls them 'horrible'
![Amazon.com : WILSON US Open Jumbo Tennis Balls - 5", Yellow, Deflated : Tennis Balls : Sports & Outdoors Amazon.com : WILSON US Open Jumbo Tennis Balls - 5", Yellow, Deflated : Tennis Balls : Sports & Outdoors](https://m.media-amazon.com/images/I/81SMOMoU8pL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : WILSON US Open Jumbo Tennis Balls - 5", Yellow, Deflated : Tennis Balls : Sports & Outdoors
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French Open: 'Wouldn't give to a dog to chew' -- tennis players complain about new balls at Roland Garros | CNN
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