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At the U.S. Open, that voice yelling 'Out!' comes from a computer | Reuters
You can't be the player's friend': inside the secret world of tennis umpires | Tennis | The Guardian
Carlos Ramos, Umpire Known for Rigidity, Lands in U.S. Open Firestorm - The New York Times
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Answered: Since an instant replay system for… | bartleby
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Why Novak Djokovic Was Disqualified From the U.S. Open - The New York Times
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Kader Nouni: The Umpire Known as the 'Barry White of Tennis' - The New York Times
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The U.S Open replaces human line judges with optical technology : NPR
Serena Williams' U.S. Open penalties spark debate over sexism in sports
