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GPS tennis offers challenge; Baylor still rules court | Chattanooga Times Free Press
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There are just no mistakes happening': Hawk-Eye Live gains more support at Australian Open
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US Open organisers express regret after Cornet warned for changing top on court - Eurosport
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/cdn.vox-cdn.com/uploads/chorus_image/image/66965544/98C410D9_133B_467E_AEA1_9D17E444A8AF.0.jpeg "2020 Challenge Cup: The rules & regulations you need to know - RSL Soapbox")
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What is the tennis challenge system? - Quora
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USTA /
Tennis Rules for Challenges - SportsRec
Forget the Calls. Players Challenge the People Who Make Them. - The New York Times
